Question:
Solve 173*k = 150*k - 207 for k..

Answer:
-9

Question:
Solve 19*s - 1153 - 200 = -22*s for s..

Answer:
33

Question:
Solve 10 = -6*y + y for y..

Answer:
-2

Question:
Solve -19 - 35 = 18*f for f..

Answer:
-3