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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)
8/(x-5)+8 = 0
8/(x-5)+(8*(x-5))/(x-5) = 0
8*(x-5)+8 = 0
8*x-32 = 0
(8*x-32)/(x-5) = 0
(8*x-32)/(x-5) = 0 // * x-5
8*x-32 = 0
8*x-32 = 0 // + 32
8*x = 32 // : 8
x = 32/8
x = 4
x = 4
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