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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/x)/(2/3) = 13 // - 13
(1/x)/(2/3)-13 = 0
3/2*x^-1 = 13 // : 3/2
x^-1 = 26/3
-1 < 0
1/(x^1) = 26/3 // * x^1
1 = 26/3*x^1 // : 26/3
3/26 = x^1
x = 3/26
x = 3/26
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