Q: What is the solution?
Solve -84*c + 86*c = 6 for c.

A: 3

Q: What is the solution?
Solve -20*l - 507 = -81*l - 690 for l.

A: -3

Q: What is the solution?
Solve 54*y - 871 - 911 = 0 for y.

A:
33