Question: What is the solution?

Solve -504315 + 140474 - 72725 = 5597*i for i.

Answer: -78

Question: What is the solution?

Solve 437*r + 37201 + 10479 = -755*r for r.

Answer: -40

Question: What is the solution?

Solve 8*d + 8*d + 2800 = -54*d for d.

Answer: -40

Question: What is the solution?

Solve 615*f - 33 = 291*f + 291*f for f.

Answer:
1