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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x-(10*x^2))/(x^2) = 0
(8*x-10*x^2)/(x^2) = 0
8*x-10*x^2 = 0
2*x*(4-5*x) = 0
4-5*x = 0 // - 4
-5*x = -4 // : -5
x = -4/(-5)
x = 4/5
2*x*(x-4/5) = 0
(2*x*(x-4/5))/(x^2) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-4/5 )
x-4/5 = 0 // + 4/5
x = 4/5
x in { 0}
x = 4/5
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