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De la ecuación I :
m = 5 + n
Reemplazo en la ecuación II:
m + n = 25
(5 + n) + n = 25
2n = 20
n = 10
m = 5 + n
m = 5 + 10
m = 15
Eso es todo, saludos
m + n = 25 ↓+
---------------
2m =30
m = 15
n = 10