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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7*x^-3*((2*4*5*x^-3*x^2*y^5)/3)*y^4 = 0
280/3*x^-4*y^9 = 0 // : 280/3*y^9
x^-4 = 0
x należy do O
x belongs to the empty set
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