Question 1061965
{{{3+sqrt(3x+39)=12}}}


Isolate the square root and then square both sides.  Determine if any found solution does or does not work.


{{{sqrt(3x+39)=9}}}
{{{3x+39=81}}}
{{{3x=81-39}}}
{{{3x=42}}}
{{{3x=2*3*7}}}
{{{highlight(x=14)}}}