Question:
Solve 0 = -155*f + 1189 + 2841 for f..

Answer:
26

Question:
Solve 85*x - 86*x - 3 = 0 for x..

Answer:
-3

Question:
Solve 0 = 859*o - 1759*o - 19800 for o..

Answer:
-22

Question:
Solve 583 = 18*o + 547 for o..

Answer:
2