Question:
Solve 5*m - 57 - 9 + 6 = 0 for m..

Answer:
12

Question:
Solve 121 + 67 = 254*a - 320 for a..

Answer:
2

Question:
Solve 13 = 12*f + 85 for f..

Answer:
-6

Question:
Solve 0 = 3*z - 29*z - 30*z + 392 for z..

Answer:
7