The 1st one is the bottom and the second one is the top
Perimeter is equalt to 2l+2w where l is the length and w is the width
or l+l+w+w
so if the perimeter is 14 feet
and the length is 4 feet
14= 4+4+r+r
14= 8+ 2r
6=2r
r=3
the length of one side is 3 feet
6x + 5 - 3x = 26
3x + 5 = 26
3x + 5 - 5 = 26 - 5
3x = 21
3x/3 = 21/3
X = 7.
The solution to the equation is X = 7.