Question:
Solve -4*q + 5 = -15 for q..

Answer:
5

Question:
Solve 74*r - 629 + 185 = 0 for r..

Answer:
6

Question:
Solve 158*c + 3807 + 251 = -1103 - 1001 for c..

Answer:
-39

Question:
Solve -14608 = 928*c + 769*c + 129*c for c..

Answer:
-8