Question:
Solve 21*s - 2*s - 231 + 41 = 0 for s..

Answer:
10

Question:
Solve -16 - 14 = 10*y for y..

Answer:
-3

Question:
Solve 513*q = 568*q + 605 for q..

Answer:
-11

Question:
Solve -118 = 8*p - 70 for p..

Answer:
-6