The perimeter of a rectangle is 20x-14. The length is 7x+1. Write a polynomial in x in the simplest form for the width.

P=2(l+w) 
P=20x-14 
l=7x+1 

20x-14=2(7x+1+w) 
D 2: 

10x-7=7x+1+w 

w=3x-8 


:)