This equation recently was found on Facebook, and I was surprised that there seemed to be two possible answers: 1, or 9. FWIW, I am in the x=1 camp as I see the problem like this:
6/2(1+2)= 6/2(3) = 6/6 = 1

It always amazes me how people want to try to redefine absolute truth. These redefinitions cause nothing but division even among the people that scream for tolerance and unity. When all they are showing is their own ignorance.
Enough of that talk about the difference between new and old math.
Math is math and no matter how you look at it, it is 9. Inside the parentheses first then left to right.

This equation recently was found on Facebook, and I was surprised how many argued for one of two possible answers: 1, or 9. Battle lines were drawn between those in the "old math" and "new math" camps, with references posted by both sides supporting the rational for their answers. I didn't monitor the posting to determine if there ever was a definitive resolution. FWIW, I was in the "old math" x=1 camp, as I see the problem as being 6 / 2(1+2) = 6 / 2(3) = 6 / 6 = 1.

I've seen some math arguments on Facebook too, and I feel like my answer is right but it makes me wonder if I forgot my math, or if the rules are different now..

I thought the answer to this should be 1, but my phone calculator says 9. I guess I can see how it would be 9.. Parenthesis comes first, but then I remember multiplication and division is done from left to right, so you end up with:
6 ÷ 2 x 3
That becomes 3 x 3 and you get 9..

It always amazes me how people want to try to redefine absolute truth. These redefinitions cause nothing but division even among the people that scream for tolerance and unity. When all they are showing is their own ignorance.
Enough of that talk about the difference between new and old math.
Math is math and no matter how you look at it it is 9. Inside the parentheses first then left to right.

Order of operations:
Pretty please my dear aunt sally.
Parentheses, powers, multiply, divide, add, subtract.

let’s make it easy rewrite it to read:
6/{2(1+2)}=X… more bracketing for convenience.
So if we divide both sides by 6 we get 2(1+2)=x/6
Then either with FOIL or the distributive property 6=X/6, divide each side by 6 and x=1

PEMDAS or in this case PMD since there are no Exponents, Addition or Subtraction. Answer is 9.

P 1+2 = 3
D 6/2 = 3
M 3x3 = 9

There is no "old" math or "new" math. There's just math and BS ways teachers try to explain it, or the methods they find acceptable to determine the answer. But the answer is always the same.

EDIT FOR CORRECTION: Double checked my work. Changes reflected above.

ANSWER IS 9. I forgot that MD and AS do not have a specific order except in the mnemonic but as @Believer7713 pointed out from left to right, (whichever comes first). Now I remember why I always hated that specific mnemonic. It's not really useful.

I used to feel that way too, but really any symbol is acceptable as long as the people doing the maths agree on the symbol.
You will see it more in higher order maths, weird symbols some of which I surmise may be unique to the equation.

The letters are just variables or unknowns, if you put a number there then it isn't variable or unknown.

PEMDAS or in this case PMD since there are no Exponents, Addition or Subtraction. Answer is 1.

P 1+2 = 3
M 2x3 = 6
D 6/6 = 1 All day long.

There is no "old" math or "new" math. There's just math and BS ways teachers try to explain it, or the methods they find acceptable to determine the answer. But the answer is always the same.