Question:
Solve 0 = 126*d - 146*d + 220 for d..

Answer:
11

Question:
Solve 348*m + 336*m + 14364 = 0 for m..

Answer:
-21

Question:
Solve 0 = -107*n + 101*n - 30 for n..

Answer:
-5

Question:
Solve -21*a = 1 - 64 for a..

Answer:
3