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We know the perimeter of a square is 4 times the length of one of it's sides. So

36 = 4 * (9x)

36 = 36x

x=1

1) a perimeter is the sum of the length of all sides

2) a square has 4 sides

3) All sides in a square are equal so.....

we can write that 36= 4 * (9x)

4*9x= 36x

36x=36

x=1

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