Question:
Solve 65*s = 85*s - 260 for s..

Answer:
13

Question:
Solve -3*k - 11 = 1 for k..

Answer:
-4

Question:
Solve -31*c - 38 = -69*c for c..

Answer:
1

Question:
Solve 13 = -32*y - 147 for y..

Answer:
-5