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D( x )
1-((1/2)*x) = 0
1-((1/2)*x) = 0
1-((1/2)*x) = 0
(-1/2)*x+1 = 0
1-1/2*x = 0 // - 1
-1/2*x = -1 // : -1/2
x = -1/(-1/2)
x = 2
x in (-oo:2) U (2:+oo)
((1/3)*x-((1/6)*x^2))/(1-((1/2)*x)) = 0
((-1/6)*x^2+(1/3)*x)/((-1/2)*x+1) = 0
(1/3*x-1/6*x^2)/(1-1/2*x) = 0
1/3*x-1/6*x^2 = 0
1/3*x*(1-1/2*x) = 0
1-1/2*x = 0 // - 1
-1/2*x = -1 // : -1/2
x = -1/(-1/2)
x = 2
1/3*x*(x-2) = 0
(1/3*x*(x-2))/(1-1/2*x) = 0
( 1/3*x )
1/3*x = 0 // : 1/3
x = 0
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 2}
x = 0
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