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D( x )
x/4 = 0
x = 0
2/x = 0
x/4 = 0
x/4 = 0
1/4*x = 0 // : 1/4
x = 0
x = 0
x = 0
2/x = 0
2/x = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((4/(2/x))/(x/4))/(1/8) = 0
64 = 0
x belongs to the empty set
x belongs to the empty set
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