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x+y=52
x=2y+13
sustituimos x=2y+13 en la primera ecuacion
x+y=52
2y+13+y=52
2y+y=52-13
3y=39
y=39/3
y=13
si y=13
x+y=52
x+13=52
x=52-13
x=39
hay 39 varones en clase