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D( x )
x^4*((6*x^7)/2) = 0
x^4*((6*x^7)/2) = 0
x^4*((6*x^7)/2) = 0
3*x^11 = 0 // : 3
x^11 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^4*((6*x^7)/2))^-3 = 0
1/27*x^-33 = 0 // : 1/27
x^-33 = 0
x należy do O
x belongs to the empty set
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