Question:
Solve -20 + 60 = -10*r for r..

Answer:
-4

Question:
Solve -81436 = -1072*h + 1108 for h..

Answer:
77

Question:
Solve -4898*d - 72821 - 73047 = 8432 + 31824 for d..

Answer:
-38

Question:
Solve 117920 = 527388*h - 530068*h for h..

Answer:
-44