Write down the solution for this math problem: Solve 42*u + 74*u - 1304 = -260 for u.
answer: 9

Write down the solution for this math problem: Solve -55*f - 10*f = 19*f + 19*f + 927 for f.
answer: -9

Write down the solution for this math problem: Solve -62*z + 21845 = -23*z + 21455 for z.
answer: 10

Write down the solution for this math problem: Solve -3865*r + 15867 = -3496*r for r.
answer:
43