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(2/3)*(x-9) = 12 // - 12
(2/3)*(x-9)-12 = 0
2/3*(x-9)-12 = 0
2/3*(x-9)-12 = 0
2/3*x-18 = 0
2/3*x-18 = 0
2/3*x-18 = 0 // + 18
2/3*x = 18 // : 2/3
x = 18/2/3
x = 27
x = 27
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