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

\begin{equation}10x^{2}y^{2}+8xy^{3}-7y^{4}-(x^{2}y^{2}-8xy^{3}+8y-8y^{4})\end{equation}

\begin{equation}10x^{3}+9x^{2}-10x+9-(5x^{3}-9x^{2}+9x-7)\end{equation}

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

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

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

\begin{equation}8A^{2}+3Ay+y-((-7)A^{2}+10Ay-2y)\end{equation}

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

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

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

\begin{equation}xy-6y^{2}+6xy^{3}-(10xy^{3}+5y^{2}+5xy)\end{equation}