Write down the solution for this math problem: Solve -4307*r = -3188*r + 4260*r - 76669 - 488126 for r.
answer: 105

Write down the solution for this math problem: Solve -2281*f = -14323*f - 189637 - 292043 for f.
answer: -40

Write down the solution for this math problem: Solve -4*b + b = 3 for b.
answer: -1

Write down the solution for this math problem: Solve 64*s - 21452 = 308*s + 102*s for s.
answer:
-62