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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/2)/3 = (2/3)/x // - (2/3)/x
(1/2)/3-((2/3)/x) = 0
(-2/3)*x^-1+(1/2)/3 = 0
-2/3*x^-1 = -1/6 // : -2/3
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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