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Ancho + Largo = 9
4 ( largo ) = 5 (Ancho)
Reemplazando
Ancho + Largo = 9
4k + 5k = 9
9k = 9
K = 1
El largo de la sala es de 5k = 5(1) = 5 metros
El ancho de la sala es de 4k = 4 ( 1) = 4 metros