Write down the solution for this math problem: Solve -21*v + 27*v - 30 = 0 for v.
answer: 5

Write down the solution for this math problem: Solve -13280*z + 120 = -13295*z for z.
answer: -8

Write down the solution for this math problem: Solve 137*h + 528 + 3762 = 454 for h.
answer: -28

Write down the solution for this math problem: Solve -7*k - 13 = 1 for k.
answer:
-2