Question:
Solve 0 = 16*r - 7*r + 36 for r..

Answer:
-4

Question:
Solve 0 = -97*c + 88*c + 99 for c..

Answer:
11

Question:
Solve -30*t + 29*t = 10 + 2 for t..

Answer:
-12

Question:
Solve -9870*p - 220907 + 64436 + 25004 = 213983 for p..

Answer:
-35