`=> 2019 x = 0` hoặc `x - 2019/2020 = 0`
`=> x = 0` hoặc `x = 2019/2020`.
`2019x(x-2019/2020) =0`
\(\Leftrightarrow\left[{}\begin{matrix}2019x=0\\x-\dfrac{2019}{2020}=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=\dfrac{2019}{2020}\end{matrix}\right.\)
=>x(x-2019/2020)=0
=>x=0 hoặc x=2019/2020