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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x+1/x-6+6 = 1/x+14 // - 1/x+14
1/x+1/x-(1/x)-14-6+6 = 0
1/x+1/x-x^-1-14-6+6 = 0
1*x^-1 = 14 // : 1
x^-1 = 14
-1 < 0
1/(x^1) = 14 // * x^1
1 = 14*x^1 // : 14
1/14 = x^1
x = 1/14
x = 1/14
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