Question:
Solve -565*a - 475*a + 38480 = 0 for a..

Answer:
37

Question:
Solve 1082 + 2122 + 605 = 67*k + 191 for k..

Answer:
54

Question:
Solve 3*a = 9*a + 6 for a..

Answer:
-1

Question:
Solve 3*r - 33*r - 23*r + 5202 = 49*r for r..

Answer:
51