x/y=3/5
x+y=72 y=72-x
x/(72-x)=3/5
x=216/5-3/5x
8/5x=216/5
x=27
si no me fume nada, su número atomico debería ser 27
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x/y=3/5
x+y=72 y=72-x
x/(72-x)=3/5
x=216/5-3/5x
8/5x=216/5
x=27
si no me fume nada, su número atomico debería ser 27