Question: What is the solution?

Solve 568*u - 5157 = -45 for u.

Answer: 9

Question: What is the solution?

Solve 714*x + 1505 = 679*x for x.

Answer: -43

Question: What is the solution?

Solve 72*v = -2509 - 11 for v.

Answer: -35

Question: What is the solution?

Solve 687*q - 3174 + 12658 = -4256 for q.

Answer:
-20