Question 905873
How to solve:

{{{ sqrt(sqrt(x+3)+x)=3 }}}
Square both sides
{{{sqrt(x+3) + x = 9}}}
{{{sqrt(x+3) = 9 - x}}}
Square again
{{{x+3 = x^2 - 18x + 81}}}
{{{x^2 - 19x + 78 = 0}}}
(x-6)*(x-13) = 0
x = 6
x = 13
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Test by subbing for x
{{{ sqrt(sqrt(6+3)+6)=3 }}}
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Same with 13