Question: What is the solution?

Solve 2569*v + 1395*v - 3339 = -571*v + 5731 for v.

Answer: 2

Question: What is the solution?

Solve -4*a - 7664 + 15369 = 7613 for a.

Answer: 23

Question: What is the solution?

Solve 78 = -79*a + 49 - 129 for a.

Answer: -2

Question: What is the solution?

Solve 1407292 = 33*h + 1408183 for h.

Answer:
-27