Question:
Solve 7*z - 3*z = -20 for z..

Answer:
-5

Question:
Solve 0 = -6*t + 35 - 53 for t..

Answer:
-3

Question:
Solve -82*z - 85*z + 188*z - 294 = 0 for z..

Answer:
14

Question:
Solve 4309*x = 4314*x - 30 for x..

Answer:
6