Question:
Solve 1402 = -515*o - 137*o - 284*o + 20122 for o..

Answer:
20

Question:
Solve 0 = -45*r - 195 + 60 for r..

Answer:
-3

Question:
Solve c = 11*c - 70 for c..

Answer:
7

Question:
Solve 0 = -11*p - 2393 + 3240 for p..

Answer:
77