Question:
Solve y - 6 = -7 for y..

Answer:
-1

Question:
Solve -728*b + 729*b - 1 = 0 for b..

Answer:
1

Question:
Solve -3*b - 15 = -18*b for b..

Answer:
1

Question:
Solve 31*h = -81*h + 6*h - 1802 for h..

Answer:
-17