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3N-D-6 =0
9N -3D -18 =0........(1)
(N+5)/(D+3) = 3/5
5N+25 = 3D + 15
5N -3D + 10 = 0........(2)
RESTANDO (1) - (2)
4N- 28 =0 ---------> N= 7
D = 15