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Porque son dos largos y dos anchos
sería:
2x + 2(40+x) = 160
factorizando:
2(x+ 40 + x) = 160
Ancho x
Largo x + 40
Ennonces x + x + x + 40 + x + 40 = 160 lo agrupamos así
x + x + 40 + 40 + x + x = 160
2x + 2*40 + 2x = 160 sacamos factor común
2 (x + 40 + x) = 160
R/ La D