Verified Answer :

\(6+2x=x-6\)
\(2x-x=-6-6\)
\(x=-12\)

The anwers is - the last equation, because having solved it, it is the same value :
\(2x=x-12\)
\(2x-x=-12\)
x=-12

I hope I was of help ;)

Dannymal

6 + 2x = x - 6
2x = x - 6 - 6
2x = x - 12
2x - x = -12
x = -12

SIMPLER WAY
6 + 2x = x - 6
Subtract 6 from both sides;
2x = x - 12
2x - x = -12
x = -12

CHECK

6 + - 24 = -12 - 6
-18 = 18!

Therefore if you see one of my workouts it has 2x - x = 12 so the one at the very right (2x - x = 12) is the answer :)

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