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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-x-(3/3)-3 = 0
x/x-x-3-1 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x = -3
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