ĐK: \(x\ge1\)
Bình phương 2 vế:
\(x-1+7x+1+2\sqrt{\left(x-1\right)\left(7x+1\right)}=14x-6\)
\(\Leftrightarrow\sqrt{7x^2-6x-1}=3\left(x-1\right)\)
\(\Leftrightarrow7x^2-6x-1=9\left(x-1\right)^2\)
\(\Leftrightarrow2\left(x^2-6x+5\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=1\\x=5\end{matrix}\right.\)