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miguel: x-10
juan: x/2
Ejercicio:
x+(x-10)+x/2=140
2x+(2x-20)+x=280
5x-20=280
5x=280+20
5x=300
x=300/5
x=60
lupita tiene $60, miguel tiene $50 y juan tiene $30
:)
miguel =50
y
juan=30