b,\(2x^2-7x+3=0\)
\(\Leftrightarrow2x^2-6x-x+3=0\)
\(\Leftrightarrow2x\left(x-3\right)-\left(x-3\right)=0\)
\(\Leftrightarrow\left(x-3\right)\left(2x-1\right)=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-3=0\\2x-1=0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x=3\\x=\dfrac{1}{2}\end{matrix}\right.\)