Question 1056457
Original rectangle  {{{2w+2L=18}}},
{{{w+L=9}}}


New rectangle, {{{2(2w)+2(3L)=46}}}
{{{2w+3L=23}}}



Simplified system to solve is {{{system(w+L=9,2w+3L=23)}}}.  Use your skills.


{{{L=5}}}