Question:
Solve -157 = 2*l - 13*l + 140 for l..

Answer:
27

Question:
Solve -23*z = -29*z - 18 for z..

Answer:
-3

Question:
Solve 38*c - 24*c - 115*c = -41*c + 2160 for c..

Answer:
-36

Question:
Solve 268*m - 3848 = 237*m + 512*m for m..

Answer:
-8