Write down the solution for this math problem: Solve -133*z + 109*z = 144 for z.
answer: -6

Write down the solution for this math problem: Solve -784 - 619 = -330*b + 6187 for b.
answer: 23

Write down the solution for this math problem: Solve -135 = -45*p - 315 for p.
answer: -4

Write down the solution for this math problem: Solve 6*a = -30*a - 64*a + 7956 - 6656 for a.
answer:
13