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(2/3)*(x-3) = 6 // - 6
(2/3)*(x-3)-6 = 0
2/3*(x-3)-6 = 0
2/3*(x-3)-6 = 0
2/3*x-8 = 0
2/3*x-8 = 0
2/3*x-8 = 0 // + 8
2/3*x = 8 // : 2/3
x = 8/2/3
x = 12
x = 12
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