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D( x )
6*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
x in (-oo:0) U (0:+oo)
(2*x-(4*x^2))/(6*x) = 0
(2*x-4*x^2)/(6*x) = 0
2*x-4*x^2 = 0
2*x*(1-2*x) = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
2*x*(x-1/2) = 0
(2*x*(x-1/2))/(6*x) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
x in { 0}
x = 1/2
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