\(\sqrt{4x+1}-\sqrt{3x+4}=1\)
\(\Leftrightarrow\sqrt{4x+1}-1=\sqrt{3x+4}\)
\(\Leftrightarrow4x+2-2\sqrt{4x+1}=3x+4\)
\(\Leftrightarrow x-2=2\sqrt{4x+1}\)
\(\Leftrightarrow x^2-4x+4=16x+4\)
\(\Leftrightarrow x^2-20x=0\)
\(\Leftrightarrow x\left(x-20\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x-20=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=20\end{matrix}\right.\)
\(S=\left\{0;20\right\}\)
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