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D( r )
r = 0
r = 0
r = 0
r in (-oo:0) U (0:+oo)
200/r+10 = 200/r-1 // - 200/r-1
200/r-(200/r)+1+10 = 0
200/r-200*r^-1+1+10 = 0
11 = 0
r belongs to the empty set
r belongs to the empty set
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