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Let the length of the longest side of the triangle be x units.
Since the lengths of the sides of the triangle are consecutive even numbers, which differ by 2, the perimeter of the triangle equals to (x - 4) + (x - 2) + x = 3x - 6.
Since the length of the longest side is 22 units shorter than the perimeter, the perimeter of the triangle also equals to x + 22. So that

3x - 6 = x + 22 (subtract x and add 6 to both sides)
3x - x + 6 - 6 = x - x + 6 + 22
2x = 28 (divide both sides by 2)
x = 14

Thus the longest side has a length of 14 units.


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Q: The length of the sides of a triangle are consecutive even numbers find the length of the longest side if it is 22 units shorter than the perimeter?
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