\(5x\left(x-2000\right)-x+2000=0\)
\(\Leftrightarrow5x\left(x-2000\right)-\left(x-2000\right)=0\)
\(\Leftrightarrow\left(x-2000\right)\left(5x-1\right)=0\)
\(\Leftrightarrow\hept{\begin{cases}x-2000=0\\5x-1=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=2000\\x=\frac{1}{5}\end{cases}}\)
\(S=\left\{2000;\frac{1}{5}\right\}\)
(Nhớ k cho mình với nhé!)