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D( x )
25*x = 0
25*x = 0
25*x = 0
25*x = 0 // : 25
x = 0
x in (-oo:0) U (0:+oo)
5/(25*x) = 0
1/5*x^-1 = 0 // : 1/5
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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