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D( x )
x-9 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:9) U (9:+oo)
((x*x^5*((4*(x+36))/9))/(x-9))*(X+9) = 0
(4*x^6*(x+36)*(X+9))/(9*(x-9)) = 0
( x+36 )
x+36 = 0 // - 36
x = -36
( x^6 )
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { -36, 0 }
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