\begin{equation}7x-7y\end{equation}

\begin{equation}x^{2}+2xy\end{equation}

\begin{equation}4x^{3}+28\end{equation}

\begin{equation}9x^{3}+80x^{2}\end{equation}

\begin{equation}24x^{3}y^{2}+56xy^{4}\end{equation}

\begin{equation}36x^{4}y^{3}-9x^{2}y^{4}\end{equation}

\begin{equation}7x^{2}y+63y\end{equation}

\begin{equation}50x^{3}-20x^{2}\end{equation}

\begin{equation}20x^{4}+24x^{2}\end{equation}

\begin{equation}60x^{2}+54y^{5}\end{equation}

\begin{equation}(-63)x^{3}+49x\end{equation}

\begin{equation}54y^{3}z+12x^{2}y\end{equation}

\begin{equation}x^{2}+9x\end{equation}

\begin{equation}3x^{3}+30\end{equation}

\begin{equation}8xy+16\end{equation}

\begin{equation}(-60)x^{3}+30x^{4}\end{equation}

\begin{equation}(-10)x^{8}y^{4}+9x^{6}y\end{equation}

\begin{equation}81xy^{2}+72y\end{equation}

\begin{equation}28x^{2}+21x^{3}\end{equation}

\begin{equation}(-18)x^{5}+36x\end{equation}

\begin{equation}8x^{4}+9x^{3}+9x^{2}\end{equation}