Question: What is the solution?

Solve -536 = 107*m + 213 for m.

Answer: -7

Question: What is the solution?

Solve -3564 + 654 = 291*c for c.

Answer: -10

Question: What is the solution?

Solve 0 = -2993*s - 112237 - 148154 for s.

Answer: -87

Question: What is the solution?

Solve -12*a + 15*a + 13 = 4*a for a.

Answer:
13