Q: What is the solution?
Solve 0 = 141*s - 117*s + 144 for s.

A: -6

Q: What is the solution?
Solve -21*x + 157 + 101 = 48 for x.

A: 10

Q: What is the solution?
Solve -5*r + 6*r = -7*r for r.

A:
0