Question:
Solve 0 = 9*q - 15*q - 6 for q..

Answer:
-1

Question:
Solve 557*r = 43632 + 3354 + 916 for r..

Answer:
86

Question:
Solve -5175*i + 36 = -5169*i for i..

Answer:
6

Question:
Solve 6304 = 637*t - 243*t for t..

Answer:
16