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Ancho=y
Perímetro= x+x+y+y=36
2x+2y=36
x+y=18
x-y=2
x+y=18
x-y=2
2x=20
x=10
Remplazamos
x+y=18
10+y=18
y=8
El largo mide 10 y el ancho mide 8