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D( x )
8*w^5*x^4 = 0
8*w^5*x^4 = 0
8*w^5*x^4 = 0
8*w^5*x^4 = 0 // : 8*w^5
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(20*x^2-(4*x^3*y^5))/(8*w^5*x^4) = 0
(20*x^2-4*x^3*y^5)/(8*w^5*x^4) = 0
20*x^2-4*x^3*y^5 = 0
4*x^2*(5-(x*y^5)) = 0
x*(-y^5)+5 = 0 // - 5
x*(-y^5) = -5 // : -y^5
x = -5/(-y^5)
x = 5/(y^5)
4*x^2*(x-5*y^-5) = 0
(4*x^2*(x-5*y^-5))/(8*w^5*x^4) = 0
( 4*x^2 )
4*x^2 = 0 // : 4
x^2 = 0
x = 0
( x-5*y^-5 )
x-5*y^-5 = 0 // + -5*y^-5
x = -(-5*y^-5)
x = 5*y^-5
x in { 0}
x = 5*y^-5
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