Question 986809
w and L for original dimensions;
{{{L=7+w}}}, given;
{{{A=wL=w(w+7)}}}


Changed dimensions;
{{{2L=2(w+L)}}} for length;
-
{{{w-3}}} for width;
{{{2L(w-3)-wL=168}}}, should make sense.
Work with this and find w and L.