Question:
Solve -461*s = -424*s - 629 for s..

Answer:
17

Question:
Solve -68 + 68 = -3*n for n..

Answer:
0

Question:
Solve -336*u + 3544 = 550*u for u..

Answer:
4

Question:
Solve 124*z - 42*z + 1121 = 23*z for z..

Answer:
-19