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x + y = 14
x - y = 10
--------------------
2x = 24
x = 12
.............................................................
x + y = 10
12 + y = 10
y = 10 - 12
y = 2
Solución.
(x = 14 y "y" = 2).
x+y=14
x-y=10
---------
2x=24
x=12
entonces si x= 12... reemplazamos: 12+y=14
y=2