Q: Solve:
Solve 167*s - 1100*s - 974*s = -171*s - 34720 for s.

A: 20

Q: Solve:
Solve -259*r + 215*r = 176 for r.

A: -4

Q: Solve:
Solve 13*f - 819 = -59*f - 45*f for f.

A:
7