Question:
Solve -740871*p + 740821*p = 5500 for p..

Answer:
-110

Question:
Solve -17*l + 786 + 689 = 1900 for l..

Answer:
-25

Question:
Solve 44*c - 23*c + 210 = 0 for c..

Answer:
-10

Question:
Solve -5*r = -42*r - 39*r for r..

Answer:
0