Finding the Unknown Sides' Lengths

The video tutorial explains how to find the missing side length of a quadrilateral when the perimeter and three side lengths are known. It begins by setting up an equation using the known values and a question mark for the unknown side. The tutorial then demonstrates solving the equation by simplifying and using subtraction to find the missing length. Finally, it verifies the solution by substituting the found value back into the original equation to ensure the perimeter is correct.

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