Question: What is the solution?

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

Answer: -2

Question: What is the solution?

Solve 6631 = -248*x - 3114 - 3142 + 983 for x.

Answer: -48

Question: What is the solution?

Solve -38*r + 829 = 1095 for r.

Answer: -7

Question: What is the solution?

Solve -163399 + 116330 - 61498 = -5737*r + 453659 for r.

Answer:
98