\(\Leftrightarrow\left[{}\begin{matrix}x-6=0\\2x-6=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6\\x=3\end{matrix}\right.\)
\((x-6)(2x-6)=0\)
\(=>\left[{}\begin{matrix}x-6=0\\2x-6=0\end{matrix}\right.=>\left[{}\begin{matrix}x=6\\2x=6\end{matrix}\right.=>\left[{}\begin{matrix}x=6\\x=3\end{matrix}\right.\)
(x - 6)(2x - 6) = 0
=> x - 6 = 0 hoặc 2x - 6 = 0
+ trường hợp 1 :
x - 6 = 0
x = 0 + 6
x = 6
+ trường hợp 2 :
2x - 6 = 0
2x = 0 + 6
2x = 6
x = 6 : 2
x = 3
vậy x = 6 hoặc x = 3
