Explicación paso a paso:
X+y=28
y=x+2
X+(X+2)=28
2X+2=28
X= 13
y= 13+2
y=15
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Explicación paso a paso:
X+y=28
y=x+2
X+(X+2)=28
2X+2=28
X= 13
y= 13+2
y=15