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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-14 = 14/x-7 // - 14/x-7
7/x-(14/x)-14+7 = 0
7/x-14*x^-1-14+7 = 0
-7*x^-1 = 7 // : -7
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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