Respuesta:
x+y=12
x+y-12=12-12
x+y-12=0
x-y=6
x-y-6=6-6
x-y-6=0
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Respuesta:
x+y=12
x+y-12=12-12
x+y-12=0
x-y=6
x-y-6=6-6
x-y-6=0