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

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

\begin{equation}4x^{3}+6x^{2}-7x+9-(9x^{3}-9x^{2}+9x-7)\end{equation}

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

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

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

\begin{equation}5A^{2}+5Ay+y-((-10)A^{2}+6Ay-9y)\end{equation}

\begin{equation}9x^{5}-8x^{4}-7-(2x^{5}+8x^{4}-3)\end{equation}

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

\begin{equation}(-2)x^{2}+5xy-3y-((-9)x^{2}-9xy+6y)\end{equation}

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