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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(7/x)+1/x = 0
3/x-7*x^-1+1/x = 0
-3*x^-1 = 0 // : -3
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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