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(2/3)*(6*x-9) = 18 // - 18
(2/3)*(6*x-9)-18 = 0
2/3*(6*x-9)-18 = 0
2/3*(6*x-9)-18 = 0
4*x-24 = 0
4*x-24 = 0
4*x-24 = 0 // + 24
4*x = 24 // : 4
x = 24/4
x = 6
x = 6
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