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