Question:
Solve -480*z + 491*z = 0 for z..

Answer:
0

Question:
Solve 0 = -69*z + 77*z - 32*z - 576 for z..

Answer:
-24

Question:
Solve g + 788 - 780 = 0 for g..

Answer:
-8

Question:
Solve 580 + 19176 = -219*u - 679*u for u..

Answer:
-22