Question:
Solve 0*l - 7*l = 0 for l..

Answer:
0

Question:
Solve 0 = 3*s + 10*s for s..

Answer:
0

Question:
Solve 786*x + 136*x + 1190*x = -103488 for x..

Answer:
-49

Question:
Solve -150*c - 878 - 922 = 0 for c..

Answer:
-12