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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
200/x-(200/x)-5 = 2 // - 2
200/x-(200/x)-5-2 = 0
200/x-200*x^-1-5-2 = 0
-7 = 0
x belongs to the empty set
x belongs to the empty set
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