Q: What is the solution?
Solve -20718*u + 20845*u = 2286 for u.

A: 18

Q: What is the solution?
Solve -3922 = -8*z - 4050 for z.

A: -16

Q: What is the solution?
Solve -1980 = -117*b + 330*b - 108*b - 141*b for b.

A:
55