Question 473158
{{{ x = 2 * sqrt(x) -1}}}
{{{ x -2 * sqrt(x)+1=0}}}
Let {{{t=sqrt(x)}}}
{{{t^2-2t+1=0}}}
{{{(t-1)^2=0}}}
{{{t-1=0}}}
{{{t=1}}}
{{{sqrt(x)=1}}}
{{{x=1}}}