\(5x\left(x-3\right)=3-x\)
\(5x^2-15x=3-x\)
\(5x^2-15x-3+x=0\)
\(5x^2-14x-3=0\)
\(5x^2+x-15x-3=0\)
\(x\left(5x+1\right)-15x-3=0\)
\(x\left(5x+1\right)-3\left(5x+1\right)=0\)
\(\left(5x+1\right)\left(x-3\right)=0\)
\(5x+1=0\) hoặc \(x-3=0\)
\(x=-\dfrac{1}{5}\) hoặc \(x=3\)
Vậy \(x=-\dfrac{1}{5}\) hoặc \(x=3\)
\(...\Leftrightarrow5x^2-15x+x-3=0\) \(\Leftrightarrow5x\left(x-3\right)+x-3=0\) \(\Leftrightarrow\left(5x+1\right)\left(x-3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{5}\\x=3\end{matrix}\right.\)
\(5x\left(x-3\right)=3-x\)
\(\Leftrightarrow5x\left(x-3\right)+\left(x-3\right)=0\)
\(\Leftrightarrow\left(5x+1\right)\left(x-3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}5x+1=0\\x-3=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{1}{5}\\x=3\end{matrix}\right.\)