Question: What is the solution?

Solve 80*s = 59*s - 189 for s.

Answer: -9

Question: What is the solution?

Solve 31*f - 48 = 76 for f.

Answer: 4

Question: What is the solution?

Solve -130584 = 99*d - 119793 for d.

Answer: -109

Question: What is the solution?

Solve -6*d = 13 - 1 for d.

Answer:
-2