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2U = ..0
U = 5, y no 0, puesto que UNI es un numeral de 3 cifras
centrales: U + I + N + 1= N
U + I + 1 = ...0
5 + I + 1=...0
entonces I = 4
primeras cifras: N + N + 1 = U, el uno es de la primera cifra U + I + N = 11 + N
si N < 9.
2N + 1 = 5
N = 2
y si N = 9 no coincide 9 + 9 + 1 = U = 5
entonces
U + N + I = 5 + 2 + 4 = 11