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D( x )
(2*x^6)/m = 0
(2*x^6)/m = 0
(2*x^6)/m = 0
2*m^-1*x^6 = 0 // : 2*m^-1
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^6)/m)^-3 = 0
1/8*m^3*x^-18 = 0 // : 1/8*m^3
x^-18 = 0
x należy do O
x belongs to the empty set
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