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largo=x
entonces:
area rectangulo = largo x ancho
550=x(x-3)
550=x²-3x
0=x²-3x-550
0=(x-25)(x+22)
x-25=0 x+22=0
x=25 x= -22
tomamos el valor positivo.
x=25
x-3.............25-3=22
el largo mide 25 m
el ancho mide 22 m