Write down the solution for this math problem: Solve 64 = 200*r - 7336 for r.
answer: 37

Write down the solution for this math problem: Solve 54*f + 677 = 2013 + 554 for f.
answer: 35

Write down the solution for this math problem: Solve 6160 = 15971*o - 16356*o for o.
answer: -16

Write down the solution for this math problem: Solve 30536 = 1044*n + 12009 - 40981 for n.
answer:
57