\begin{equation}2x-2y\end{equation}

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

\begin{equation}11x^{3}+33\end{equation}

\begin{equation}4x^{3}+50x^{2}\end{equation}

\begin{equation}30x^{3}y^{2}+30xy^{4}\end{equation}

\begin{equation}56x^{4}y^{3}-72x^{2}y^{4}\end{equation}

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

\begin{equation}16x^{3}-40x^{2}\end{equation}

\begin{equation}40x^{4}+20x^{2}\end{equation}

\begin{equation}60x^{2}+48y^{5}\end{equation}

\begin{equation}(-42)x^{3}+70x\end{equation}

\begin{equation}90y^{3}z+9x^{2}y\end{equation}

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

\begin{equation}8x^{3}+16\end{equation}

\begin{equation}5xy+35\end{equation}

\begin{equation}(-64)x^{3}+16x^{4}\end{equation}

\begin{equation}(-7)x^{8}y^{4}+6x^{6}y\end{equation}

\begin{equation}16xy^{2}+40y\end{equation}

\begin{equation}80x^{2}+72x^{3}\end{equation}

\begin{equation}(-28)x^{5}+28x\end{equation}

\begin{equation}35x^{4}+14x^{3}+56x^{2}\end{equation}