Question:
Solve 0 = -21*m + 4*m - 13*m for m..

Answer:
0

Question:
Solve 2008 - 5159 = -767*a + 51393 + 4515 for a..

Answer:
77

Question:
Solve -1750*n - 3312*n - 3913*n - 422631 = 124844 for n..

Answer:
-61

Question:
Solve -8*a - 36 + 116 = 0 for a..

Answer:
10