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