Question:
Solve 0 = -10*r + 31 + 9 for r..

Answer:
4

Question:
Solve 34*q + 138*q - 39 = -383 for q..

Answer:
-2

Question:
Solve 27*w = -11*w + 152 for w..

Answer:
4

Question:
Solve 1970*v - 98681 = -35641 for v..

Answer:
32