Q: What is the solution?
Solve 521*s + 404 = 3009 for s.

A: 5

Q: What is the solution?
Solve -94*d = -253 + 663 + 782 + 218 for d.

A: -15

Q: What is the solution?
Solve -4034*f + 603 = -3967*f for f.

A:
9