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D( x )
8*x-6 = 0
8*x-6 = 0
8*x-6 = 0
8*x-6 = 0 // + 6
8*x = 6 // : 8
x = 6/8
x = 3/4
x in (-oo:3/4) U (3/4:+oo)
(8*x^3-(6*x^2))/(8*x-6) = 0
(8*x^3-6*x^2)/(8*x-6) = 0
8*x^3-6*x^2 = 0
2*x^2*(4*x-3) = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
2*x^2*(x-3/4) = 0
(2*x^2*(x-3/4))/(8*x-6) = 0
( 2*x^2 )
2*x^2 = 0 // : 2
x^2 = 0
x = 0
( x-3/4 )
x-3/4 = 0 // + 3/4
x = 3/4
x in { 3/4}
x = 0
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