Question:
Solve 6*c - 2*c = -20 for c..

Answer:
-5

Question:
Solve -9*f - 1793 = -1811 for f..

Answer:
2

Question:
Solve -233 - 42 = 25*m for m..

Answer:
-11

Question:
Solve 0 = 92261*v - 93170*v - 8181 for v..

Answer:
-9