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conejos = x tiene 4 patas
gallinas = 132-x tienen 2 patas
R// : conejos 78, gallinas 54
espero os sirva
resolucion
4x +2(132-x) = 420
4x +264-2x = 420
2x = 420-264
2x = 156
x = 156/2
x = 78
hay 78 conejos
gallinas 123-78 = 54