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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(1/2)*(x/3-(5/6)) = (1/3)*(1/(2*x)-2)+1/4 // - (1/3)*(1/(2*x)-2)+1/4
(1/2)*(x/3-(5/6))-((1/3)*(1/(2*x)-2))-(1/4) = 0
(1/2)*(x/3-5/6)+(-1/3)*(1/(2*x)-2)-1/4 = 0
1/2*(1/3*x-5/6)-1/3*(1/2*x^-1-2)-1/4 = 0
(1/2*4*(1/3*x-5/6))/4+(-1/3*4*(1/2*x^-1-2))/4-1/4 = 0
1/2*4*(1/3*x-5/6)-1/3*4*(1/2*x^-1-2)-1 = 0
2/3*x-2/3*x^-1-1+1 = 0
2/3*x-2/3*x^-1 = 0
2/3*x-2/3*x^-1 = 0
2/3*x^-1*(x^2-1) = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
2/3*x^-1*(x-1)*(x+1) = 0
(2/3*x^-1*(x-1)*(x+1))/4 = 0
(2/3*x^-1*(x-1)*(x+1))/4 = 0 // * 4
2/3*x^-1*(x-1)*(x+1) = 0
( 2/3*x^-1 )
2/3*x^-1 = 0 // : 2/3
x^-1 = 0
x naleu017Cy do O
( x+1 )
x+1 = 0 // - 1
x = -1
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -1, 1 }
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