Q: What is the solution?
Solve -50*r = -15*r + 70 for r.

A: -2

Q: What is the solution?
Solve l + 55*l + 392 = 0 for l.

A: -7

Q: What is the solution?
Solve -3974 - 7386 + 45020 = -1195*c + 430*c for c.

A:
-44