Q: What is the solution?
Solve -40 = 30*w - 40*w for w.

A: 4

Q: What is the solution?
Solve -7*v + 56 - 21 = 0 for v.

A: 5

Q: What is the solution?
Solve -87*c + 4084 = -371*c + 19420 for c.

A:
54