Hey, the right answer is D
the answer is D both A and C are correct you need to look at how the person routine change just in case you might have said something wrong it's important to know how people feel
3x + 7 = x - 15
First, make sure to subtract

from both sides.
Second, simplify 3x - x to get 2x, and then keep the 7.
Third, subtract

from both sides.
Fourth, simplify -15 - 7 to get -22.
Fifth, take the 2 and divide both sides by it, keeping the

by itself.
Sixth, since 11 goes into 2 to get 22, simplify the fraction to 11.

Answer:
x = -11
It is answer A and if it's not which im sure it is, it is answer D