Question 433129
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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