Question:
Solve -71*f - 255 = -20*f for f..

Answer:
-5

Question:
Solve -360*w + 18496 = 605*w + 57096 for w..

Answer:
-40

Question:
Solve 348*r - 76*r = 1360 for r..

Answer:
5

Question:
Solve -39*i + 7 - 46 = 0 for i..

Answer:
-1