Write down the solution for this math problem: Solve -13*x = 6 - 84 for x.
answer: 6

Write down the solution for this math problem: Solve -23*s - 9*s + 99 - 411 - 168 = 0 for s.
answer: -15

Write down the solution for this math problem: Solve 55*a - 2689 - 1246 = -34*a - 286 for a.
answer: 41

Write down the solution for this math problem: Solve 0 = 12*z + 43*z - 120 - 265 for z.
answer:
7