the lenght of a rectangle is 7cm greater than the width. Find the length and the width of a rectangle if the perimeter is 54cm

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let the  width be x cm.therefore, the length of rectangle is (x+7)cm.we know that perimeter of triangle = 2(l+b).therefore from here54 = 2(x+7+x).54 = 2(2x+7).54 = 4x + 14.4x = 40x = 10