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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x+1/x-5 = 9/x-5 // - 9/x-5
9/x+1/x-(9/x)-5+5 = 0
9/x+1/x-9*x^-1-5+5 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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