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x in (-oo:+oo)
(x-4)/18 = 2/9 // - 2/9
(x-4)/18-(2/9) = 0
(x-4)/18-2/9 = 0
(9*(x-4))/(9*18)+(-2*18)/(9*18) = 0
9*(x-4)-2*18 = 0
9*x-72 = 0
(9*x-72)/(9*18) = 0
(9*x-72)/(9*18) = 0 // * 9*18
9*x-72 = 0
9*x-72 = 0 // + 72
9*x = 72 // : 9
x = 72/9
x = 8
x = 8
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