Question: What is the solution?

Solve 15*f + 3092 = 2987 for f.

Answer: -7

Question: What is the solution?

Solve 64*x = -11*x - 450 for x.

Answer: -6

Question: What is the solution?

Solve -573*u - 648 = -312*u - 297*u for u.

Answer: 18

Question: What is the solution?

Solve -9 = -685*q + 686*q for q.

Answer:
-9