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(2/3)*(12*x-9) = 15 // - 15
(2/3)*(12*x-9)-15 = 0
2/3*(12*x-9)-15 = 0
2/3*(12*x-9)-15 = 0
8*x-21 = 0
8*x-21 = 0
8*x-21 = 0 // + 21
8*x = 21 // : 8
x = 21/8
x = 21/8
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