Question: What is the solution?

Solve -42*r + 3295 - 2371 = 0 for r.

Answer: 22

Question: What is the solution?

Solve 84*c - 154*c = 535*c + 5445 for c.

Answer: -9

Question: What is the solution?

Solve 440 = 180*d - 2440 for d.

Answer: 16

Question: What is the solution?

Solve -3565*b + 20036 = -30281 - 13528 - 28845 for b.

Answer:
26