Question: What is the solution?

Solve -9675 = 113*r - 254*r - 7115 - 23287 for r.

Answer: -147

Question: What is the solution?

Solve 2528*m + 36855 = -124937 for m.

Answer: -64

Question: What is the solution?

Solve 613 - 119 = -494*f for f.

Answer: -1

Question: What is the solution?

Solve 10*r - 25 = -35 for r.

Answer:
-1