Question:
Solve -12 = -24*x + 21*x for x..

Answer:
4

Question:
Solve -115860*w + 115823*w = -962 for w..

Answer:
26

Question:
Solve -2988*l - 42 - 598 = -3008*l for l..

Answer:
32

Question:
Solve 639*c + 10693 - 42747 = 122*c for c..

Answer:
62