Question:
Solve -63*p + 63 = -72*p for p..

Answer:
-7

Question:
Solve -19 = -3*a - 7 for a..

Answer:
4

Question:
Solve 306987*f - 1917 = 307200*f for f..

Answer:
-9

Question:
Solve -86*q + 97*q + 33 = 0 for q..

Answer:
-3