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(2/3)*(9*x+27)-27 = 81 // - 81
(2/3)*(9*x+27)-81-27 = 0
2/3*(9*x+27)-81-27 = 0
2/3*(9*x+27)-81-27 = 0
6*x-63-27 = 0
6*x-90 = 0
6*x-90 = 0
6*x-90 = 0 // + 90
6*x = 90 // : 6
x = 90/6
x = 15
x = 15
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