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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x+1/x-6 = 8/x-6 // - 8/x-6
8/x+1/x-(8/x)-6+6 = 0
8/x+1/x-8*x^-1-6+6 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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