if the lenenght is 3 feet less than twice the width of a 57 foot perimeter what is the width?

i'm trying to find the width of a rectangle if the length is three feet less than twice the width of a perimeter of fifty seven feet.
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mi ges at wot yu shood hav sed is. . . . rektangel, rim-leng=57, leng=(2*wide)-3 . . . half-rim=57/2=28.5=leng+wide . . . (2*wide)-3 +wide=28.5 . . . 3*wide-3=28.5 . . . 3*wide=31.5 . . . wide=31.5/3=10.5 . . . leng=2*wide-3=21-3=18
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