Question:
Solve -3*r + 45 - 21 = 0 for r..

Answer:
8

Question:
Solve 2055*c + 7541 = 1999*c + 2725 for c..

Answer:
-86

Question:
Solve 106*t + 124*t - 43*t + 284 = -7383 for t..

Answer:
-41

Question:
Solve 0 = 163*p - 173*p - 50 for p..

Answer:
-5