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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x+2 = 4/3 // - 4/3
(2*x)/x-(4/3)+2 = 0
(2*x)/x-4/3+2 = 0
8/3 = 0
x belongs to the empty set
x belongs to the empty set
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