Question:
Solve -10 = -10*v - 10 for v..

Answer:
0

Question:
Solve 9*h - 5*h + 12 = 0 for h..

Answer:
-3

Question:
Solve 168*c + 60 = 153*c for c..

Answer:
-4

Question:
Solve 8456673*v - 8456422*v = -12550 for v..

Answer:
-50