\(7x^2+6x=5x\)
\(\Leftrightarrow7x^2+6x-5x=0\)
\(\Leftrightarrow7x^2+x=0\)
\(\Leftrightarrow x\left(7x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\7x+1=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-\frac{1}{7}\end{matrix}\right.\)