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D( x )
15*x = 0
15*x = 0
15*x = 0
15*x = 0 // : 15
x = 0
x in (-oo:0) U (0:+oo)
4.5/(15*x) = 0
0.3*x^-1 = 0 // : 0.3
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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