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D( x )
5*x-25 = 0
5*x-25 = 0
5*x-25 = 0
5*x-25 = 0 // + 25
5*x = 25 // : 5
x = 25/5
x = 5
x in (-oo:5) U (5:+oo)
(x/(5*x-25))*((x^2-(5*x))/9) = 0
(x/(5*x-25))*((x^2-5*x)/9) = 0
(x*(x^2-5*x))/(9*(5*x-25)) = 0
x^2-5*x = 0
x*(x-5) = 0
x-5 = 0 // + 5
x = 5
x*(x-5) = 0
(x^2*(x-5))/(9*(5*x-25)) = 0
( x-5 )
x-5 = 0 // + 5
x = 5
( x )
x = 0
x in { 5}
x in { 0, 0 }
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