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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((18*x^-14*x^3)/2)*x^2 = 0
9*x^-9 = 0 // : 9
x^-9 = 0
x należy do O
x belongs to the empty set
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