Question 1043173
{{{N+N^2=(1/2)(N^2-N)}}}
{{{2N+2N^2=N^2-N}}}
{{{N^2+3N=0}}}
{{{N(N+3)=0}}}
Two solutions:
{{{N=0}}}
and
{{{N+3=0}}}
{{{N=-3}}}