Question: What is the solution?

Solve 0 = -9*u + u - 40 for u.

Answer: -5

Question: What is the solution?

Solve 134103 - 133465 = -29*t for t.

Answer: -22

Question: What is the solution?

Solve -2*r = -7*r - 5 for r.

Answer: -1

Question: What is the solution?

Solve -22*f = -18*f + 8 for f.

Answer:
-2