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(2/3)*(9*y-12) = 28 // - 28
(2/3)*(9*y-12)-28 = 0
2/3*(9*y-12)-28 = 0
2/3*(9*y-12)-28 = 0
6*y-36 = 0
6*y-36 = 0
6*y-36 = 0 // + 36
6*y = 36 // : 6
y = 36/6
y = 6
y = 6
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