Question:
Solve 0 = 15*z - 133*z + 826 for z..

Answer:
7

Question:
Solve -18*r + 25*r + 42 = 0 for r..

Answer:
-6

Question:
Solve -25*k = 9 - 209 for k..

Answer:
8

Question:
Solve -2745 = -589*p - 17711 - 5060 for p..

Answer:
-34