Question 919705
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
     *[illustration rectangle.png].
P = 2L + 2w
2(x+5) + 2(x-3) = 40cm
4x = 36
x = 9cm
L = 14cm {{{9+5}}}  and w = 6cm {{{9-3}}}
and...checking
P = 28cm + 12cm = 40cm