Question:
Solve -2 = 15*z - 13*z for z..

Answer:
-1

Question:
Solve -36*c - 109 = -325 for c..

Answer:
6

Question:
Solve 0*p = -p - 2 for p..

Answer:
-2

Question:
Solve 120*h + 215 = 77*h for h..

Answer:
-5