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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x+1 = 1-(8/x)+6 // - 1-(8/x)+6
8/x+8/x-6-1+1 = 0
16*x^-1 = 6 // : 16
x^-1 = 3/8
-1 < 0
1/(x^1) = 3/8 // * x^1
1 = 3/8*x^1 // : 3/8
8/3 = x^1
x = 8/3
x = 8/3
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