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