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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14 = 5/x // - 5/x
14-(5/x) = 0
14-5*x^-1 = 0
-5*x^-1 = -14 // : -5
x^-1 = 14/5
-1 < 0
1/(x^1) = 14/5 // * x^1
1 = 14/5*x^1 // : 14/5
5/14 = x^1
x = 5/14
x = 5/14
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