Question 12309
{{{3s(x-3s)=t(x-t)}}}
{{{3sx-9s^2=tx-t^2}}}
{{{3sx-tx-9s^2=-t^2}}}
{{{3sx-tx=9s^2-t^2}}}
{{{x(3s-t)=9s^2-t^2}}}
{{{x=(9s^2-t^2)/(3s-t)}}}
{{{x=((3s)^2-(t)^2)/(3s-t)}}}
{{{x=((3s-t)(3s+t))/(3s-t)}}}
{{{x=3s+t}}}


jon.