Question 988344
{{{3x^2+3x=21}}}
{{{3x^2+3x-21=0}}}
{{{3(x^2+x-7)=0}}}
{{{x^2+x-7=0}}}
{{{x^2+x+(1/2)^2-7=(1/2)^2}}}
{{{(x^2+x+1/4)=1/4+7}}}
{{{(x+1/2)^2=1/4+28/4}}}
{{{(x+1/2)^2=29/4}}}
{{{x+1/2=0 +- sqrt(29)/4}}}
{{{x=-1/2 +- sqrt(29)/4}}}