Question:
Solve -5405*n + 140 = -5395*n for n..

Answer:
14

Question:
Solve -249*q + 109*q = -113*q + 864 for q..

Answer:
-32

Question:
Solve 3 = -3*i + 9 for i..

Answer:
2

Question:
Solve -12708 = -651*n - 761*n for n..

Answer:
9