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juan=x
juan + carlos = 48
3x + x = 48
4x=48
x=12
entonces remplazamos
carlos= 3x=3(12)= 36
juan =x=12
Y=juan
X=3y
X+y=48
X=48-y
(48-y)=3y
-y-3y=-48
-4y=-48
Y=-48/(-4)
Y=12
X=3(12)
X=36
Carlos tiene 36 y juan 12
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