Question:
Solve -3234 = -81*i + 228*i for i..

Answer:
-22

Question:
Solve 280 = 50*r - 20 for r..

Answer:
6

Question:
Solve -2505*s = -2390*s + 3565 for s..

Answer:
-31

Question:
Solve -9*k - 740 - 828 + 1262 = 0 for k..

Answer:
-34