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x in (-oo:+oo)
(x+2)/3 = 8/9 // - 8/9
(x+2)/3-(8/9) = 0
(x+2)/3-8/9 = 0
(9*(x+2))/(3*9)+(-8*3)/(3*9) = 0
9*(x+2)-8*3 = 0
9*x-6 = 0
(9*x-6)/(3*9) = 0
(9*x-6)/(3*9) = 0 // * 3*9
9*x-6 = 0
9*x-6 = 0 // + 6
9*x = 6 // : 9
x = 6/9
x = 2/3
x = 2/3
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