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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/45 = (2*x)/x // - (2*x)/x
30/45-((2*x)/x) = 0
30/45-2 = 0
-4/3 = 0
x belongs to the empty set
x belongs to the empty set
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