Q: What is the solution?
Solve 7*r - 786 = -807 for r.

A: -3

Q: What is the solution?
Solve 110*m - 196*m = -106*m - 60 - 220 for m.

A: -14

Q: What is the solution?
Solve -85*z - 263 + 1198 = 0 for z.

A:
11