Question:
Solve 15*c = 50 - 20 for c..

Answer:
2

Question:
Solve -43*h - 44 - 16 = -53*h for h..

Answer:
6

Question:
Solve 28*c + 105 = 7*c for c..

Answer:
-5

Question:
Solve 230*n - 643*n + 4956 = 0 for n..

Answer:
12