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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50/x-(50/x)-5 = 1/2 // - 1/2
50/x-(50/x)-(1/2)-5 = 0
50/x-50*x^-1-1/2-5 = 0
-11/2 = 0
x belongs to the empty set
x belongs to the empty set
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