\begin{equation}4x^{2}+7x-9-(3x^{2}+10)\end{equation}

\begin{equation}10x^{2}y^{2}+4xy^{3}-2y^{4}-(x^{2}y^{2}-5xy^{3}+10y-4y^{4})\end{equation}

\begin{equation}10x^{3}+5x^{2}-6x+2-(4x^{3}-8x^{2}+9x-6)\end{equation}

\begin{equation}6x^{4}y+8x^{3}y^{2}-3x^{2}y^{3}-(7x^{4}y+2x^{3}y^{2}-3xy)\end{equation}

\begin{equation}2x^{2}-8x+9-(9x^{2}+9x+2)\end{equation}

\begin{equation}10x+3-(2x^{2}-9x+9)\end{equation}

\begin{equation}9A^{2}+5Ay+y-((-9)A^{2}+10Ay-2y)\end{equation}

\begin{equation}7x^{5}-9x^{4}-2-(10x^{5}+8x^{4}-7)\end{equation}

\begin{equation}(-10)x^{4}+9x^{2}y-2x+y-((-9)x^{4}-4x^{2}y+x)\end{equation}

\begin{equation}(-5)x^{2}+7xy-3y-((-5)x^{2}-9xy+4y)\end{equation}

\begin{equation}xy-3y^{2}+2xy^{3}-(4xy^{3}+2y^{2}+6xy)\end{equation}