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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x+8)/(x-2) = 8/7 // - 8/7
(x+8)/(x-2)-(8/7) = 0
(x+8)/(x-2)-8/7 = 0
(7*(x+8))/(7*(x-2))+(-8*(x-2))/(7*(x-2)) = 0
7*(x+8)-8*(x-2) = 0
72-x = 0
(72-x)/(7*(x-2)) = 0
(72-x)/(7*(x-2)) = 0 // * 7*(x-2)
72-x = 0
72-x = 0 // - 72
-x = -72 // * -1
x = 72
x = 72
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