Question:
Solve 352 = 219*k - 175*k for k..

Answer:
8

Question:
Solve -6*l - 145*l = 21*l + 5291 - 5807 for l..

Answer:
3

Question:
Solve -159*n + 522*n = 278*n + 1870 for n..

Answer:
22

Question:
Solve 0 = 6*c - 8*c + 4 for c..

Answer:
2