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x=2y
x-y+12=15..............x-y=15-12...............x-y=3..........x=y+3
hacemos igualacion.
2y=y+3
2y-y=3
y=3
si y=3
x=2y
x=2(3)
x=6
decenas x=6
unidades y=6
el numero es el 63