Question 415878
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Hi
Let x and (2x-7ft) represent the widthe and length respectively
Question states***
  2(2x-7) + 2x = 64ft
Solving for x
   6x = 78
    x = 13ft, the width.  The length is 19ft   (26ft-7ft
CHECKING our Answer***
 2*19ft + 2*13ft = 38ft + 26ft = 64ft 
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">