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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1*14)/3 = (14/3)/x // - (14/3)/x
(1*14)/3-((14/3)/x) = 0
(-14/3)*x^-1+14/3 = 0
-14/3*x^-1 = -14/3 // : -14/3
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x = 1
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