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{x - 9 = y
* x - 9 = y
x - y = 9
metodo: reduccion
x + y = 27
x - y = 9
---------------
2x // = 36
2x = 36
x = 36/2
x = 18
comprobamos
* x + y = 27
18 + y = 27
y = 27 - 18
y = 9
el numero mayor es 18//