Question:
Solve 620*d - 10397 = 2003 for d..

Answer:
20

Question:
Solve 1685 = -147*w + 5282 + 6189 + 2562 for w..

Answer:
84

Question:
Solve 2198*d - 176 = 2214*d for d..

Answer:
-11

Question:
Solve 2124 = 2966*f - 2848*f for f..

Answer:
18