Q: Solve -4*f = 6*f - 20 for f.

A: 2

Q: Solve 7*c - 16*c - 22 = 68 for c.

A: -10

Q: Solve -455 - 427 = 42*l for l.

A: -21

Q: Solve -26*x = 37 + 15 for x.

A:
-2