Question:
Solve -76*h = -72*h - 4 for h..

Answer:
1

Question:
Solve 161*s + 248*s + 1020 = 154*s for s..

Answer:
-4

Question:
Solve 0 = 80*y + 90*y + 202*y - 29760 for y..

Answer:
80

Question:
Solve 27*f - 287 = 31 - 21 for f..

Answer:
11