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y=9-x
x^2+(9-x)^2=53
x^2+81-18x+x^2=53
2x^2-18x+28=0
x^2-9x+14=0
(x-7)(x-2)=0
x-7=0
x=7
x-2=0
x=2
Los números son 7 y 2