Question: What is the solution?

Solve 6*c = -4*c - 40 for c.

Answer: -4

Question: What is the solution?

Solve 5*n - 605 + 655 = 0 for n.

Answer: -10

Question: What is the solution?

Solve 108*z - 101*z = 0 for z.

Answer: 0

Question: What is the solution?

Solve 0 = 2*q - 0*q + 2 for q.

Answer:
-1