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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/5 = ((9/20)*x)/x // - ((9/20)*x)/x
1/5-(((9/20)*x)/x) = 0
1/5-9/20 = 0
-1/4 = 0
x belongs to the empty set
x belongs to the empty set
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