Question:
Solve 8*k - 6 = 18 for k..

Answer:
3

Question:
Solve 51*z + 234 + 231 = -42*z for z..

Answer:
-5

Question:
Solve -81*h - 143 = -24*h - 29 for h..

Answer:
-2

Question:
Solve -1601*f - 18 = -1598*f for f..

Answer:
-6