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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
7/(x-5) = 8 // - 8
7/(x-5)-8 = 0
7/(x-5)+(-8*(x-5))/(x-5) = 0
7-8*(x-5) = 0
47-8*x = 0
(47-8*x)/(x-5) = 0
(47-8*x)/(x-5) = 0 // * x-5
47-8*x = 0
47-8*x = 0 // - 47
-8*x = -47 // : -8
x = -47/(-8)
x = 47/8
x = 47/8
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