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(2/3)*(3*x+9) = 8 // - 8
(2/3)*(3*x+9)-8 = 0
2/3*(3*x+9)-8 = 0
2/3*(3*x+9)-8 = 0
2*x-2 = 0
2*x-2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x = 1
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