Q: Solve 0 = 29*b + 28*b - 50*b + 70 for b.

A: -10

Q: Solve -12*u = 9*u + 105 for u.

A: -5

Q: Solve -127*v + 65*v + 3503 = 51*v for v.

A: 31

Q: Solve -12*v = -9*v + 3 for v.

A:
-1