\begin{equation}3x-3y\end{equation}

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

\begin{equation}10x^{3}+30\end{equation}

\begin{equation}3x^{3}+16x^{2}\end{equation}

\begin{equation}12x^{3}y^{2}+36xy^{4}\end{equation}

\begin{equation}6x^{4}y^{3}-18x^{2}y^{4}\end{equation}

\begin{equation}6x^{2}y+30y\end{equation}

\begin{equation}80x^{3}-32x^{2}\end{equation}

\begin{equation}72x^{4}+8x^{2}\end{equation}

\begin{equation}49x^{2}+49y^{5}\end{equation}

\begin{equation}(-56)x^{3}+72x\end{equation}

\begin{equation}60y^{3}z+24x^{2}y\end{equation}

\begin{equation}x^{2}+10x\end{equation}

\begin{equation}10x^{3}+60\end{equation}

\begin{equation}10xy+80\end{equation}

\begin{equation}(-10)x^{3}+100x^{4}\end{equation}

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

\begin{equation}54xy^{2}+45y\end{equation}

\begin{equation}40x^{2}+40x^{3}\end{equation}

\begin{equation}(-90)x^{5}+36x\end{equation}

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