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D( x )
(x-11)^6 = 0
(x-11)^6 = 0
(x-11)^6 = 0
x-11 = 0 // + 11
x = 11
x in (-oo:11) U (11:+oo)
(x^4*(11-x))/((x-11)^6) = 0
( 11-x )
11-x = 0 // - 11
-x = -11 // * -1
x = 11
( x^4 )
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in { 11}
x = 0
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