Question: What is the solution?

Solve 0 = 219*z - 264*z - 405 for z.

Answer: -9

Question: What is the solution?

Solve -26116*q + 29935*q = -87837 for q.

Answer: -23

Question: What is the solution?

Solve 0 = 283*r + 1402416 - 1404397 for r.

Answer: 7

Question: What is the solution?

Solve 50*a = -40 - 260 for a.

Answer:
-6