Question 870101
{{{L=-3+w}}}, using L for length, w for width.
The area value means wL=130.  Substitute.


{{{w(w-3)=130}}}
{{{w^2-3w-130=0}}}
{{{(w+3)(w-10)=0}}}


The solution which makes sense is {{{w=10}}}.
{{{L=7}}}