Write down the solution for this math problem: Solve -1613215*n + 1613242*n = -1458 for n.
answer: -54

Write down the solution for this math problem: Solve -3*f = -3 + 18 for f.
answer: -5

Write down the solution for this math problem: Solve 0 = -364*f + 401*f - 259 for f.
answer: 7

Write down the solution for this math problem: Solve 159221 - 160430 = -93*b for b.
answer:
13