Question: What is the solution?

Solve 167*r + 12216 = 8709 for r.

Answer: -21

Question: What is the solution?

Solve -3*m + 14437 = 14452 for m.

Answer: -5

Question: What is the solution?

Solve -10*u - 33 = -43 for u.

Answer: 1

Question: What is the solution?

Solve 0 = -4*u - 46 + 38 for u.

Answer:
-2