Question 993466
w and L, garden dimensions.
u, the uniform width of the border around the garden.
{{{L=2w-3}}} according to the description.
{{{A=221}}}, the border path's area.


Total Area, {{{(w+2u)(L+2u)}}}
Border Area,  {{{(w+2u)(L+2u)-wL=A}}}
Simplify this A equation, at least partially:
{{{wL+2uL+2uw-wL-A=0}}}
{{{2uL+2uw-A=0}}}



Substitute for L according to the description.
{{{highlight_green(2u(2w-3)+2uw-A=0)}}}
.......Can you take this the rest of the way?