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x+y=40
x=y ..............3x=y
3
sustituimos y=3x,en la primera ecuacion
x+y=40
x+3x=40
4x=40
x=40/4
x=10
si x=10
3x=y
3(10)=y
30=y
Enrique tiene 10 años y Andres tiene 30 años
(1/3+×=40)3
3×/3+3×=120
×+3×=120
×=120/4
×=30
1/3×30/1=30/3=10
×(30)= 30×
ENRIQUE:10 Y ANDRES:30