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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/2)*x-((x/x)*x)-4+4 = 0
(1/2)*x-x-4+4 = 0
-1/2*x = 0 // : -1/2
x = 0
x in { 0}
x belongs to the empty set
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