Question 877024
w for width
L for length
w=-1+L, translated words to number description; and wL=12.  Simply substitute...
{{{(L-1)L=12}}}
{{{L^2-L=12}}}
{{{L^2-L-12=0}}}
{{{(L-4)(L+3)=0}}}
Accept L=4 and reject L=-3.
Conitnue from there.