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D( x )
x^357 = 0
x^357 = 0
x^357 = 0
1*x^357 = 0 // : 1
x^357 = 0
x = 0
x in (-oo:0) U (0:+oo)
20/(x^357) = 0
20*x^-357 = 0 // : 20
x^-357 = 0
x naleu017Cy do O
x belongs to the empty set
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