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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(26/3)/x = 26/7 // - 26/7
(26/3)/x-(26/7) = 0
(26/3)/x-26/7 = 0
26/3*x^-1 = 26/7 // : 26/3
x^-1 = 3/7
-1 < 0
1/(x^1) = 3/7 // * x^1
1 = 3/7*x^1 // : 3/7
7/3 = x^1
x = 7/3
x = 7/3
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