Given that,

• Length of the rectangle = (7x-3) [l]

• Breadth of the rectangle = (3x-4) [b]

We know perimeter of the rectangle = 2(l+b)

⇒ 2(7x-3+(3x-4))

⇒ 2(7x-3+3x-4)

⇒ 2(10x+1)

⇒ 20x+2

∴ The perimeter of the Rectangle is 20x+2.

Hope this helps you.

Thank you for your question.

Mark me as Brainleist.

Step-by-step explanation:

perimeter of rectangle =2(l+b)

=2(7×-3+3×-4)

=2(-21+(-12))

=2(-21-12)

=2(-33)

=-66