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