Question: What is the solution?

Solve 4*u - 2350 = -2390 for u.

Answer: -10

Question: What is the solution?

Solve -541*v = -489*v + 1352 for v.

Answer: -26

Question: What is the solution?

Solve -1 - 3 = v for v.

Answer: -4

Question: What is the solution?

Solve 625*c - 635*c = 51 + 19 for c.

Answer:
-7