2x(x-3)-x+3=0 Giúp mình với

#andy

\[\begin{array}{l}
2x\left( {x - 3} \right) - x + 3 = 0\\
 \Leftrightarrow {\rm{ 2}}x\left( {x-3} \right)-\left( {x-3} \right) = 0\\
 \Leftrightarrow \left( {x-3} \right)\left( {2x-1} \right){\rm{ = }}0\\
 \Leftrightarrow \left[ \begin{array}{l}
x-3 = 0\\
2x-1 = 0
\end{array} \right. \Leftrightarrow \left[ \begin{array}{l}
x = 3\\
x = \frac{1}{2}
\end{array} \right.
\end{array}\]