\(\left(x^2+2015x\right)\left(\dfrac{1}{2016}+\dfrac{1}{1008}+\dfrac{1}{672}+1\right)=2022\)
\(\Leftrightarrow\left(x^2+2015x\right).\dfrac{2022}{2016}=2022\)
\(\Leftrightarrow x^2+2015x=2016\)
\(\Leftrightarrow x^2+2015x-2016=0\)
\(\Leftrightarrow\left(x-1\right)\left(x+2016\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=1\\x=-2016\end{matrix}\right.\)