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