ĐKXĐ: \(x\ge-\frac{1}{2}\)
\(\Leftrightarrow\sqrt{2x+1}=\sqrt{x+3}+2\)
\(\Leftrightarrow2x+1=x+3+4+4\sqrt{x+3}\)
\(\Leftrightarrow4\sqrt{x+3}=x-6\) (\(x\ge6\))
\(\Leftrightarrow16\left(x+3\right)=x^2-12x+36\)
\(\Leftrightarrow x^2-28x-12=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=14+4\sqrt{13}\\x=14-4\sqrt{13}\left(l\right)\end{matrix}\right.\)