Question:
Solve 639*y - 575*y - 7749 = -1738*y - 225791 for y..

Answer:
-121

Question:
Solve -40*b + 113 = -47 for b..

Answer:
4

Question:
Solve 0 = 21*h - 12*h - 54 for h..

Answer:
6

Question:
Solve 4319 - 12455 = 452*z for z..

Answer:
-18