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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x+1/x-3 = 6/x-3 // - 6/x-3
6/x+1/x-(6/x)-3+3 = 0
6/x+1/x-6*x^-1-3+3 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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