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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+2/x = 8/x+1/3 // - 8/x+1/3
6/x+2/x-(8/x)-(1/3) = 0
6/x+2/x-8*x^-1-1/3 = 0
-1/3 = 0
x belongs to the empty set
x belongs to the empty set
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