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