Question:
Solve 20*r - 33*r - 2697 = -35*r - 9*r for r..

Answer:
87

Question:
Solve 5*s = -45 + 30 for s..

Answer:
-3

Question:
Solve -w - 1117 = 139*w + 143 for w..

Answer:
-9

Question:
Solve -79*r = -94*r - 60 for r..

Answer:
-4