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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*x^-4)/15)*y = 0
1/5*x^-4*y = 0 // : 1/5*y
x^-4 = 0
x należy do O
x belongs to the empty set
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