If 7a - 3b = 10b + 40 = -12b - 2a, what is the value of 9a + 9b?
Choose one
A) -5
B) -3
C) 0
D) 3
E) 5
(i) 7a - 13b = 40   (ii) 2a + 22b = -40   Adding (i) and (ii):   9a + 9b = 0   The answer is 0.
<result>C</result>
If 7a - 3b = 10b + 40 = -12b - 2a, what is the value of 9a + 9b?