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3.8 = x + 2y
Despejas x de la primera
x = 2.6 -y
Sustituyes x en la segunda:
3.8 = 2.6 - y + 2y
Despejas y:
y= 3.8 - 2.6
Sandwich: 1.2
Leche = x = 2.6-1.2 = 1.4