Đáp án + Giải thích các bước giải:
`a)`
`2x(x-3)-(3-x)=0`
`<=>2x(x-3)+(x-3)=0`
`<=>(x-3)(2x+1)=0`
`<=>` \(\left[ \begin{array}{l}x-3=0\\2x+1=0\end{array} \right.\)
`<=>` \(\left[ \begin{array}{l}x=3\\x=-\dfrac{1}{2}\end{array} \right.\)
`b)`
`3x(x+5)-6(x+5)=0`
`<=>(x+5)(3x-6)=0`
`<=>` \(\left[ \begin{array}{l}x+5=0\\3x-6=0\end{array} \right.\)
`<=>` \(\left[ \begin{array}{l}x=-5\\x=2\end{array} \right.\)
