Question 1154791
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x*(x-3) = 0.75x^2


Since x is not zero, you can divide both sides by x. You will get


x - 3 = 0.75x

x - 0.75x = 3

0.25x = 3

x = 3/0.25 = 12.


<U>ANSWER</U>.  The side length of the original square is 12 units.
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Solved.