Hi

Let x represent the length of the side of the square

rectangle: 2x and (x-3) the length and width

Question states***

 2x(x-3) = x^2

 2x^2 -6x = x^2

  x^2-6x = 0

 x(x-6) = 0

   x = 6 units, the length of the side of the square



CHECKING our Answer***

  12*3 = 36



  

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