Question:
Solve 0 = 13*s + 42 + 10 for s..

Answer:
-4

Question:
Solve 465 + 1871 + 2042 = 219*q - 878 for q..

Answer:
24

Question:
Solve 8377 + 71659 + 54565 = 8422*c + 8271 for c..

Answer:
15

Question:
Solve -152*m + 259 = 1333 + 142 for m..

Answer:
-8