Question:
Solve 38*j = 31*j + 21 for j..

Answer:
3

Question:
Solve -845*f = -856*f - 66 for f..

Answer:
-6

Question:
Solve 0 = 4*w - 20 + 8 for w..

Answer:
3

Question:
Solve 58*c - 2*c + 55*c - 999 = 0 for c..

Answer:
9