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2L + 2A = 18m (ecuacion 1)
4L = 5A (ecuacion 2)
Despejar L de la ecuacion 1
2L + 2A = 18m
2L= 18m -2A
L=9m - A
Reemplazar L en la ecuacion 2
4(9m-A) = 5A
36m-4A = 5A
36m = 5A+4A
36m = 9A
36m/9 = A
4m = A (el ancho es de 4metros)
2L + 2A= 18m
2L + 2(4m) = 18m
2L + 8m = 18m
2L = 18m - 8m
2L = 10m
L = 10m/2
L = 5m ( el largo de la habitacion es de 5metros)