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n in (-oo:+oo)
(3*n-2)/18 = 5/9 // - 5/9
(3*n-2)/18-(5/9) = 0
(3*n-2)/18-5/9 = 0
(9*(3*n-2))/(9*18)+(-5*18)/(9*18) = 0
9*(3*n-2)-5*18 = 0
27*n-108 = 0
(27*n-108)/(9*18) = 0
(27*n-108)/(9*18) = 0 // * 9*18
27*n-108 = 0
27*n-108 = 0 // + 108
27*n = 108 // : 27
n = 108/27
n = 4
n = 4
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