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Suerte.
y=Pavos
x + y = 58
4x + 2y = 168
x = 58 - y
4(58 - y) + 2y = 168
232 - 4y +2y = 168
232 - 168 = 4y -2y
64 = 2y
32 = y
(Sustituimos la y en donde despejamos la x)
x = 58 - 32
x = 26
Solución:
En la granja hay un total de 26 cerdos y 32 pavos.