Let, the length of the rectangle be (7x + 9y) units
Breadth of the rectangle be (6x - 5y) units
Perimeter of the rectangle = 2(length + breadth)
= 2[(7x + 9y) + (6x - 5y)]
= 2(13x + 4y)
= (26x + 8y) units
⇒ Perimeter of the rectangle is (26x + 8y) units