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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 9/14 // - 9/14
1/x-(9/14) = 0
1/x-9/14 = 0
1*x^-1 = 9/14 // : 1
x^-1 = 9/14
-1 < 0
1/(x^1) = 9/14 // * x^1
1 = 9/14*x^1 // : 9/14
14/9 = x^1
x = 14/9
x = 14/9
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