If 7a - 3b = 10b + 50 = -12b - 2a, what is the value of 9a + 9b?	Choose the correct choice from the following answers.
A) -9
B) -6
C) 0
D) 6
E) 9
(i) 7a - 13b = 50   (ii) 2a + 22b = -50   Adding (i) and (ii):   9a + 9b = 0   The answer is 0.
<result>C</result>
If 7a - 3b = 10b + 50 = -12b - 2a, what is the value of 9a + 9b?