Write down the solution for this math problem: Solve 31*r = 91*r + 43*r + 1442 for r.
answer: -14

Write down the solution for this math problem: Solve -252*z - 2331 - 3969 = 0 for z.
answer: -25

Write down the solution for this math problem: Solve 5*m - 29*m = 16*m - 720 for m.
answer: 18

Write down the solution for this math problem: Solve 0*s = 18*s - 512 + 332 for s.
answer:
10