Question:
Solve 6*s = s + 15 for s..

Answer:
3

Question:
Solve 20811*k = 20428*k - 40598 for k..

Answer:
-106

Question:
Solve 56*z + 13*z - 24*z = 450 for z..

Answer:
10

Question:
Solve -1333*w - 29*w = -16344 for w..

Answer:
12