Write down the solution for this math problem: Solve 0 = -19*f + 14*f - 25 for f.
answer: -5

Write down the solution for this math problem: Solve -662*k - 92*k + 3247 + 9803 = -29*k for k.
answer: 18

Write down the solution for this math problem: Solve 0*d + 11*d + 440 = -44*d for d.
answer: -8

Write down the solution for this math problem: Solve -21 - 12 = -6*o + 9 for o.
answer:
7