Question:
Solve -562 = -6*i - 502 for i..

Answer:
10

Question:
Solve -13*q + 17 = 69 for q..

Answer:
-4

Question:
Solve 43*s = 42*s + 4 for s..

Answer:
4

Question:
Solve -3194*s + 21 = -3191*s for s..

Answer:
7