Question:
Solve -972 = -109*i + 28*i for i..

Answer:
12

Question:
Solve 0 = -4*f + 111 - 131 for f..

Answer:
-5

Question:
Solve -53785*c = -56470*c + 169155 for c..

Answer:
63

Question:
Solve -17*v - 1 = -18*v for v..

Answer:
1