Question:
Solve 485*i = 484*i - 6 for i..

Answer:
-6

Question:
Solve -4 - 51 = -11*r for r..

Answer:
5

Question:
Solve 2116*p + 444 = 2153*p for p..

Answer:
12

Question:
Solve 1 = -10*c + 11 for c..

Answer:
1