Question 970678
It's the fifth root, not the fifth square root. 
{{{3((x+3)^2)^(1/5)+3=27}}}
{{{3((x+3)^2)^(1/5)=24}}}
{{{((x+3)^2)^(1/5)=8}}}
{{{(x+3)^2=32768}}}
{{{x+3=0  +- 128sqrt(2)}}}
{{{x=-3 +- 128sqrt(2)}}}