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(2/3)*(12-(9*a)) = 15-(3*(4*a-2)) // - 15-(3*(4*a-2))
(2/3)*(12-(9*a))+3*(4*a-2)-15 = 0
(2/3)*(12-9*a)+3*(4*a-2)-15 = 0
2/3*(12-9*a)+3*(4*a-2)-15 = 0
2/3*(12-9*a)+3*(4*a-2)-15 = 0
6*a-15+2 = 0
6*a-13 = 0
6*a-13 = 0
6*a-13 = 0 // + 13
6*a = 13 // : 6
a = 13/6
a = 13/6
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