Question 880767
{{{32=2(L+w)}}}
{{{l = w+4}}}

This should already make it easy now, if not :

{{{32 = 2 (w+4+w)}}}
{{{32 = 2w + 8 + 2w}}}
{{{32 = 4w+8}}}
{{{24 = 4w}}}
{{{6 = w}}}
{{{L = 10}}}