Question:
Solve 0 = 19*x - 10*x - 63 for x..

Answer:
7

Question:
Solve 22 = 5*d - 3 for d..

Answer:
5

Question:
Solve 11*h = -10 - 1 for h..

Answer:
-1

Question:
Solve 5*a - 8*a = 0 for a..

Answer:
0