Question:
Solve 665*r - 39886 = 5999 for r..

Answer:
69

Question:
Solve -2731 = 2*r - 5*r - 2695 for r..

Answer:
12

Question:
Solve 149*k + 2418 - 1992 = -14325 for k..

Answer:
-99

Question:
Solve 10 = -114*x + 922 for x..

Answer:
8