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You have to make the denominators(bottom of the fraction) the same in order to combine the fractions.
To make the denominator of the same as
, you multiply the top and bottom of the fraction by 2 (because they both have a common multiple of 4)
So:
Let s be the side length of the square. The dimensions of the rectangle are three times the side of the square (i.e. 3s), and two less than the side of the square (i.e. s-2).
So, the area of this rectangle is
The area of the square is , and we know that the two areas are the same, so we have
The solution s=0 would lead to the extreme case where the rectangle and the square are actually a point, so we accept the solution s=3.