Question:
Solve 3*a - 30 = -3*a for a..

Answer:
5

Question:
Solve 24 = 1967*u - 1964*u for u..

Answer:
8

Question:
Solve 0 = 2*h - 6*h - 12 for h..

Answer:
-3

Question:
Solve 12*w = 3*w - 0 + 153 for w..

Answer:
17