Question:
Solve 0 = -231*k - 231*k + 466*k + 36 for k..

Answer:
-9

Question:
Solve -123*f - 28467 + 62569 = 920*f - 61854 for f..

Answer:
92

Question:
Solve -1085 = 64*r - 219*r for r..

Answer:
7

Question:
Solve -596526*n + 8832 = -596654*n for n..

Answer:
-69