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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(((x-1)*(x-7))/(x-1))*(x-6)*(x-3) = 0
(x-7)*(x-6)*(x-3) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x-6 )
x-6 = 0 // + 6
x = 6
( x-7 )
x-7 = 0 // + 7
x = 7
x in { 3, 6, 7 }
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