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gallinas = 70 - x
Numero de patas
conejos = 4x
gallinas = 2( 70 - x)
4x + 2( 70 - x) = 220
4x +140 -2x = 220
2x = 220 -140
2x =80
x = 80/2
x = 40
Hay
40 conejos
gallinas 70 -40 = 30