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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+2 = 8/x // - 8/x
6/x-(8/x)+2 = 0
6/x-8*x^-1+2 = 0
-2*x^-1 = -2 // : -2
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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