Question:
Solve -7 - 20 = 9*u for u..

Answer:
-3

Question:
Solve 9*b = -78 + 15 for b..

Answer:
-7

Question:
Solve -5317*h + 5258*h = -944 for h..

Answer:
16

Question:
Solve 493 = 4*m + 513 for m..

Answer:
-5