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(3/4)*(8*a-16)-((1/3)*(12-6*a)) = 0
(3/4)*(8*a-16)+(-1/3)*(12-6*a) = 0
3/4*(8*a-16)-1/3*(12-6*a) = 0
3/4*(8*a-16)-1/3*(12-6*a) = 0
8*a-16 = 0
8*a-16 = 0
8*a-16 = 0 // + 16
8*a = 16 // : 8
a = 16/8
a = 2
a = 2
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