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(2/3)*(9*x-21) = 5 // - 5
(2/3)*(9*x-21)-5 = 0
2/3*(9*x-21)-5 = 0
2/3*(9*x-21)-5 = 0
6*x-19 = 0
6*x-19 = 0
6*x-19 = 0 // + 19
6*x = 19 // : 6
x = 19/6
x = 19/6
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