Q: What is the solution?
Solve 21 = -10*i + 81 for i.

A: 6

Q: What is the solution?
Solve -5*r + 22*r + 119 = 0 for r.

A: -7

Q: What is the solution?
Solve 0 = 15*m + 24 + 66 for m.

A:
-6