Question:
Solve -13793 + 11800 - 7181 = 139*z for z..

Answer:
-66

Question:
Solve -51*l = -25*l - 32*l - 18 for l..

Answer:
-3

Question:
Solve -12*m - 1036 = -1132 for m..

Answer:
8

Question:
Solve -61485 + 53849 = -83*r for r..

Answer:
92