Q: Solve -138*w - 40*w = 3738 for w.

A: -21

Q: Solve 15 = -2*v + 7*v for v.

A: 3

Q: Solve -70 = 3*m - 61 for m.

A: -3

Q: Solve 42 = -15*g + 9*g for g.

A:
-7