Write down the solution for this math problem: Solve 111*f = 142*f + 854*f + 754*f - 1639 for f.
answer: 1

Write down the solution for this math problem: Solve 113733 = -853*q + 47199 for q.
answer: -78

Write down the solution for this math problem: Solve -27*k = -183*k - 936 for k.
answer: -6

Write down the solution for this math problem: Solve 109*r - 17996 = -375*r + 75*r for r.
answer:
44