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D( x )
x/100 = 0
x/100 = 0
x/100 = 0
1/100*x = 0 // : 1/100
x = 0
x in (-oo:0) U (0:+oo)
x/(x/100) = 0
100 = 0
x belongs to the empty set
x belongs to the empty set
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