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(2/3)*(6*x-12) = 20 // - 20
(2/3)*(6*x-12)-20 = 0
2/3*(6*x-12)-20 = 0
2/3*(6*x-12)-20 = 0
4*x-28 = 0
4*x-28 = 0
4*x-28 = 0 // + 28
4*x = 28 // : 4
x = 28/4
x = 7
x = 7
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