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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.7474 = (200*x)/x // - (200*x)/x
2.7474-((200*x)/x) = 0
2.7474-200 = 0
-197.2526 = 0
x belongs to the empty set
x belongs to the empty set
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