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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-6 = 3/x-8 // - 3/x-8
x/x-(3/x)-6+8 = 0
x/x-3*x^-1-6+8 = 0
-3*x^-1 = -3 // : -3
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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