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y= conejos
x+y= 28 (-2)
2x+4y= 80
-2x -2y = -56
2x+4y = 80
----------------
// 2y = 24
y= 24/2
y= 12
x+y= 28
x+12= 28
x= 28-12
x= 16
R= Hay 16 gallinas y 12 conejos