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x+y=30
2x+4y=84
hacemos reduccion.
-2(x+y=30)..............-2x-2y= -60
2x+4y=84...............2x+4y=84
2y=24......y=24/2..............y=12
si y=12
x+y=30
x+12=30
x=30-12
x=18
hay 18 gallinas y 12 conejos