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(2/3)*(6*x-12) = 18 // - 18
(2/3)*(6*x-12)-18 = 0
2/3*(6*x-12)-18 = 0
2/3*(6*x-12)-18 = 0
4*x-26 = 0
4*x-26 = 0
4*x-26 = 0 // + 26
4*x = 26 // : 4
x = 26/4
x = 13/2
x = 13/2
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