Question:
Solve 0 = -11*d + 79 + 109 + 87 for d..

Answer:
25

Question:
Solve -832 = 229*f - 603 for f..

Answer:
-1

Question:
Solve 20*o + 14 = 94 for o..

Answer:
4

Question:
Solve 0 = -667*f - 241*f - 17252 for f..

Answer:
-19