Question:
Solve -192 = s - 196 for s..

Answer:
4

Question:
Solve 40*h = 44*h - 12 for h..

Answer:
3

Question:
Solve 0 = -29*r + 291 - 84 + 170 for r..

Answer:
13

Question:
Solve 817*h - 4 = 815*h for h..

Answer:
2