Question:
Solve -2*c + 2*c + 10 = 5*c for c..

Answer:
2

Question:
Solve -1177*u - 253*u + 42376 = 1436*u - 69398 for u..

Answer:
39

Question:
Solve -222*s + 648 = -240 for s..

Answer:
4

Question:
Solve -2*l - 17 = -15 for l..

Answer:
-1