Write down the solution for this math problem: Solve 520 = c + 513 for c.
answer: 7

Write down the solution for this math problem: Solve 22*t = -t - 203*t + 678 for t.
answer: 3

Write down the solution for this math problem: Solve 2985*i = 2979*i - 4 - 2 for i.
answer: -1

Write down the solution for this math problem: Solve 1721 - 524 = 17*f + 32*f - 1204 for f.
answer:
49