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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((X^7)/2)*x^-12*y^6 = 0
1/2*X^7*x^-12*y^6 = 0 // : 1/2*X^7*y^6
x^-12 = 0
x należy do O
x belongs to the empty set
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