Question: What is the solution?

Solve 2*c = 8*c + 30 for c.

Answer: -5

Question: What is the solution?

Solve -4 = 2*z - 6*z for z.

Answer: 1

Question: What is the solution?

Solve -58*x - 144*x - 159*x = -1083 for x.

Answer: 3

Question: What is the solution?

Solve 12*h + 340 = 31 - 39 for h.

Answer:
-29