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D( x )
5*x-8 = 0
5*x-8 = 0
5*x-8 = 0
5*x-8 = 0 // + 8
5*x = 8 // : 5
x = 8/5
x in (-oo:8/5) U (8/5:+oo)
(4*x+5)/(5*x-8) = 13/9 // - 13/9
(4*x+5)/(5*x-8)-(13/9) = 0
(4*x+5)/(5*x-8)-13/9 = 0
(9*(4*x+5))/(9*(5*x-8))+(-13*(5*x-8))/(9*(5*x-8)) = 0
9*(4*x+5)-13*(5*x-8) = 0
149-29*x = 0
(149-29*x)/(9*(5*x-8)) = 0
(149-29*x)/(9*(5*x-8)) = 0 // * 9*(5*x-8)
149-29*x = 0
149-29*x = 0 // - 149
-29*x = -149 // : -29
x = -149/(-29)
x = 149/29
x = 149/29
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