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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-4*((36*x^4*y^-6)/54)*y^9 = 0
2/3*y^3 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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