Question:
Solve 31*n + 40978619 = 40983021 for n..

Answer:
142

Question:
Solve -106*c + 110*c = 0 for c..

Answer:
0

Question:
Solve -160 = -8*f - 112 for f..

Answer:
6

Question:
Solve -359 - 331 = 230*x for x..

Answer:
-3