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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7*8*x^-4*x^(2/3)*x^2 = 0
56*x^(-4/3) = 0 // : 56
x^(-4/3) = 0
x należy do O
x belongs to the empty set
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