Concept:
The formula for the perimeter of a square with side L is given below as

From the question, the perimeter of the square is given below as

Step 1: Substitute the expression above in the formula of the perimeter

Step 2: Factorize the perimeter 4x+24 by involving brackets

Step 3:
To find the value of the length of one side of the square, we will divide both sides by 4

Hence,
The length of one side of the square = x+6