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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-8+3 = x/x-8 // - x/x-8
x/x-(x/x)-8+3+8 = 0
x/x-8-1+3+8 = 0
3 = 0
x belongs to the empty set
x belongs to the empty set
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