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10x+y-10y-x=27
hacemos operaciones
x+y=9
9x-9y=27
div la 2ª por 9, y tenemos
x+y=9
x-y=3
despejamos x en las dos
x=9-y
x=3+y
igualamos
9-y=3+y
9-3=2y
6=2y
y=6/2=3
x+y=9
x=9-3=6
y=3 x=6