Question:
Solve 5*x + 0 = 20 for x..

Answer:
4

Question:
Solve -2187*l + 2 = -2188*l for l..

Answer:
-2

Question:
Solve -5484 = -639*w + 1545 for w..

Answer:
11

Question:
Solve 7 = -614*l + 621*l for l..

Answer:
1