Q: What is the solution?
Solve 0 = -23*r + 20*r - 12 for r.

A: -4

Q: What is the solution?
Solve -162*m - 271 - 3170 = -10*m - 41*m for m.

A: -31

Q: What is the solution?
Solve -63*l + 2108 = 1352 for l.

A:
12