`12+(2x-11)=53`
`2x-11=53-12`
`2x-11=41`
`2x=41+11`
`2x=52`
`x=52:2`
`x=26`
___________________________
`x.(x+11)=0`
`=>`\(\left[{}\begin{matrix}x=0\\x+11=0\end{matrix}\right.\)
`=>` \(\left[{}\begin{matrix}x=0\\x=0-11=-11\end{matrix}\right.\)
Vậy...
