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D( x )
x*(2*x-5) = 0
5*x = 0
x*(2*x-5) = 0
x*(2*x-5) = 0
( 2*x-5 )
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
( x )
x = 0
5*x = 0
5*x = 0
5*x = 0 // : 5
x = 0
x in (-oo:0) U (0:5/2) U (5/2:+oo)
1/(x*(2*x-5))+1/(5*x) = -2/25 // + -2/25
1/(x*(2*x-5))+1/(5*x)-(-2/25) = 0
1/(x*(2*x-5))+1/(5*x)+2/25 = 0
(1*5*25*x)/(5*25*x*x*(2*x-5))+(1*25*x*(2*x-5))/(5*25*x*x*(2*x-5))+(2*5*x*x*(2*x-5))/(5*25*x*x*(2*x-5)) = 0
1*25*x*(2*x-5)+2*5*x*x*(2*x-5)+1*5*25*x = 0
20*x^3+50*x^2-50*x^2 = 0
20*x^3 = 0
(20*x^3)/(5*25*x*x*(2*x-5)) = 0
(20*x^3)/(5*25*x*x*(2*x-5)) = 0 // * 5*25*x*x*(2*x-5)
20*x^3 = 0
20*x^3 = 0 // : 20
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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