Question:
Solve -42699*x = -42700*x - 42 for x..

Answer:
-42

Question:
Solve 40 = 85*x - 75*x for x..

Answer:
4

Question:
Solve 8*p + 15649 - 15681 = 0 for p..

Answer:
4

Question:
Solve 65*l - 58*l = -35 for l..

Answer:
-5