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x 21
_ = __
y 15
Simplificamos
x 7
_ = _ x=7
y 5 y=5
TADAAAAAAAAAAAA.
Espero haberte ayudado ^^
x/y=7/5=k⇒x=7k
y=5k
x+y=12
7k+5k=12
12k=12
k=1
x=7(1)=7
y=5(1)=5