Question:
Solve 61*f = 62*f - 5 for f..

Answer:
5

Question:
Solve -c + 11*c + 1686 - 3551 + 1385 = 0 for c..

Answer:
48

Question:
Solve -70*r + 390 = -31*r for r..

Answer:
10

Question:
Solve -245*q = 225*q - 457*q - 143 for q..

Answer:
11