Hi,

One side of a square is 3x + 2 feet long.  Another side is 5x - 8 feet long. 

How long is each side of the square?  Note: all sides of a square are of equal length

  3x + 2 = 5x - 8

Solving for x

      10 = 2x

       5 = x

And 3x+2 = 17, the length of each side of the square 

CHECKING our Answer***

(Note: 5x-8 = 17 as well) 

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