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D( x )
(x-5)^2 = 0
(x^6)/((x-5)^2) = 0
x^2-25 = 0
(x-5)^2 = 0
(x-5)^2 = 0
x-5 = 0 // + 5
x = 5
(x^6)/((x-5)^2) = 0
(x^6)/((x-5)^2) = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x^2-25 = 0
x^2-25 = 0
1*x^2 = 25 // : 1
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in (-oo:-5) U (-5:0) U (0:5) U (5:+oo)
((7*x^4)/(x^2-25))/((x^6)/((x-5)^2)) = 0
(7*x^4*(x-5)^2)/(x^6*(x^2-25)) = 0
( 7*x^4 )
7*x^4 = 0 // : 7
x^4 = 0
x = 0
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 0}
x in { 5}
x belongs to the empty set
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