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D( x )
x^15 = 0
x^15 = 0
x^15 = 0
1*x^15 = 0 // : 1
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*x^4)^3)/(x^15) = 0
216*x^-3 = 0 // : 216
x^-3 = 0
x należy do O
x belongs to the empty set
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