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x-y=7
Paso 2) x=25-y
25-y-y=7
Paso 3) x=25-y
25-2y=7
Paso 4) x=25-y
25-7= 2y
Paso 5) x= 25-y
18=2y
Paso 6) x=25-y
y= 18/2
y=9
Solución: X vale 16 e Y vale 9