Write down the solution for this math problem: Solve -15*f + 0*f = -75 for f.
answer: 5

Write down the solution for this math problem: Solve 5*x - 85 = -110 for x.
answer: -5

Write down the solution for this math problem: Solve -1804*y = 1253 - 8469 for y.
answer: 4

Write down the solution for this math problem: Solve 66*z - 1 = 67*z for z.
answer:
-1