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x in (-oo:+oo)
(4*x-9)/9+(6*x-6)/8 = 9 // - 9
(4*x-9)/9+(6*x-6)/8-9 = 0
(8*(4*x-9))/(8*9)+(9*(6*x-6))/(8*9)+(-9*8*9)/(8*9) = 0
8*(4*x-9)+9*(6*x-6)-9*8*9 = 0
86*x-648-126 = 0
86*x-774 = 0
(86*x-774)/(8*9) = 0
(86*x-774)/(8*9) = 0 // * 8*9
86*x-774 = 0
86*x-774 = 0 // + 774
86*x = 774 // : 86
x = 774/86
x = 9
x = 9
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