Write down the solution for this math problem: Solve -3200 + 6025 = -728*b - 3727 for b.
answer: -9

Write down the solution for this math problem: Solve 57*f - 39*f - 47*f + 87 = 0 for f.
answer: 3

Write down the solution for this math problem: Solve 2*n - 17*n - 30 = 0 for n.
answer: -2

Write down the solution for this math problem: Solve 4129*r - 95*r - 47*r + 91701 = 0 for r.
answer:
-23