\(2016x^2-x-2017=0\\ \Leftrightarrow2016x^2+2016x-2017x-2017=0\\ \Leftrightarrow2016x\left(x+1\right)-2017\left(x+1\right)=0\\ \Leftrightarrow\left(x+1\right)\left(2016x-2017\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x+1=0\\2016x-2017=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-1\\x=\dfrac{2017}{2016}\end{matrix}\right.\)