3x+7= -11+2x

my answer
x=1

well, did you check it?

3*1+7 = 10
-11 + 2*1 = -9
Bzzzt, but thanks for playing

3x+7 = -11+2x
subtract 7+2x from both sides and you have

x = -18

check:

3(-18)+7 = -47
-11+2(-18) = -47
That's better.

So, how did you come up with 1?