Q: What is the solution?
Solve 0 = -q + 56 - 58 for q.

A: -2

Q: What is the solution?
Solve 22 = -3*p + 7 for p.

A: -5

Q: What is the solution?
Solve 91*f + 78*f = 20*f - 894 for f.

A:
-6