Question:
Solve -69696 = 172*d + 1764*d for d..

Answer:
-36

Question:
Solve -39*c = -36*c - 15 for c..

Answer:
5

Question:
Solve -8*r - 5 = 3 for r..

Answer:
-1

Question:
Solve -51*x + 56*x + 5 = 0 for x..

Answer:
-1