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