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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-4 = 18/8 // - 18/8
x/x-(18/8)-4 = 0
x/x-9/4-4 = 0
-21/4 = 0
x belongs to the empty set
x belongs to the empty set
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