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El consecutivo = m + 1
Resolvemos :
4 (m + m + 1) = 3 (7) - 1
4 (2m + 1) = 21 - 1
8m + 4 = 20
8m = 20 - 4
8m = 16
m = 16/8
m = 2
Solución : El número es = 2