Question:
Solve -i - 16 = -22 for i..

Answer:
6

Question:
Solve 0 = 12*f - 14*f - 2 for f..

Answer:
-1

Question:
Solve -321*m + 261 + 236 = -145 for m..

Answer:
2

Question:
Solve 126*n - 137*n + 99 = 0 for n..

Answer:
9