Question 1124447
{{{system(w+d=38,w+9=3(d+9))}}}


{{{w+9=3d+27}}}
{{{w-3d=18}}}
{{{w-3(38-w)=18}}}
{{{w-3*38+3w=18}}}
{{{4w=18+3*38}}}
{{{highlight(w=33)}}}