Write down the solution for this math problem: Solve 528*w + 56 = 521*w for w.
answer: -8

Write down the solution for this math problem: Solve 39 = 17*o - 165 for o.
answer: 12

Write down the solution for this math problem: Solve -10 = 40*c + 70 for c.
answer: -2

Write down the solution for this math problem: Solve -8*z - 21 = -5 for z.
answer:
-2