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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(5*x-8)/(x-6) = 0
5*x-8 = 0 // + 8
5*x = 8 // : 5
x = 8/5
x = 8/5
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