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D( r )
3*r-4-1 = 0
3*r-4-1 = 0
3*r-4-1 = 0
3*r-5 = 0 // + 5
3*r = 5 // : 3
r = 5/3
r in (-oo:5/3) U (5/3:+oo)
4/(3*r-4-1) = 0
4/(3*r-5) = 0
r belongs to the empty set
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