Question:
Solve 0 = -20*n + 28*n - 48 for n..

Answer:
6

Question:
Solve -15923*t = -428431 - 26220 + 112041 - 405771 for t..

Answer:
47

Question:
Solve 0 = 175*z - 109*z + 924 for z..

Answer:
-14

Question:
Solve -850*f - 2704*f = 394494 for f..

Answer:
-111