Question:
Solve 0 = -13*q + 142 - 38 for q..

Answer:
8

Question:
Solve -40 = 11*a - a for a..

Answer:
-4

Question:
Solve 16261*m - 28814 = 3057*m + 55703 + 34319 for m..

Answer:
9

Question:
Solve -106927 = 1461*r + 20180 for r..

Answer:
-87