Q: What is the solution?
Solve 18310 = 21*d - 5*d + 18118 for d.

A: 12

Q: What is the solution?
Solve 109 = 92*s - 87*s - 16 for s.

A: 25

Q: What is the solution?
Solve -7*o - 95*o = 102 for o.

A:
-1