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D( x )
8*x-2 = 0
8*x-2 = 0
8*x-2 = 0
8*x-2 = 0 // + 2
8*x = 2 // : 8
x = 2/8
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
(4*x^4-x^3)/(8*x-2) = 0
4*x^4-x^3 = 0
x^3*(4*x-1) = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x^3*(x-1/4) = 0
(x^3*(x-1/4))/(8*x-2) = 0
( x-1/4 )
x-1/4 = 0 // + 1/4
x = 1/4
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 1/4}
x = 0
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