Question:
Solve -4*l = 18887565 - 18887537 for l..

Answer:
-7

Question:
Solve 4 = 6*t - 7*t for t..

Answer:
-4

Question:
Solve 199*z = -155*z - 57*z - 15618 for z..

Answer:
-38

Question:
Solve -8*z + 0 = -40 for z..

Answer:
5