Write down the solution for this math problem: Solve -31*z = -143*z + 397*z + 365*z - 32500 for z.
answer: 50

Write down the solution for this math problem: Solve 361*s - 7616 = 89*s for s.
answer: 28

Write down the solution for this math problem: Solve k + 2*k - 6*k = 0 for k.
answer: 0

Write down the solution for this math problem: Solve 29*i + 56 = 58 + 201 for i.
answer:
7