" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x - 5 = y
entonces
restamos las ecuaciones
y da
7 = y
entonces y = 7 (el hermano peque)
sustituimos
x - 5 = 7
x = 7+5 = 12 (Elena)
SUERTE