Question:
Solve 50*o - 39*o = 0 for o..

Answer:
0

Question:
Solve -73*j = -22*j + 909 - 42 for j..

Answer:
-17

Question:
Solve -30*i + 159 = 159 for i..

Answer:
0

Question:
Solve -777 = -14954*z + 14991*z for z..

Answer:
-21