Question:
Solve 49*c + 138 = 40 for c..

Answer:
-2

Question:
Solve -17*k + 111 = 9 for k..

Answer:
6

Question:
Solve 16*x - 22*x = -30 for x..

Answer:
5

Question:
Solve -3040*h = 78049 - 11169 for h..

Answer:
-22