Question:
Solve 0 + 7 = v + 2 for v..

Answer:
5

Question:
Solve -25 = 56*w + 31 for w..

Answer:
-1

Question:
Solve -11*j + 75 - 82 = 81 for j..

Answer:
-8

Question:
Solve 39 = -68*w + 81*w for w..

Answer:
3