\begin{equation}\frac{4x^{2}}{8} \times \frac{6}{x}\end{equation}

\begin{equation}\frac{6x}{x-7} \times \frac{4(x-7)}{5x}\end{equation}

\begin{equation}\frac{x+9}{x+6} \times \frac{x+6}{x+4}\end{equation}

\begin{equation}\frac{2(x+2)}{x+4} \times \frac{4(x+4)}{2}\end{equation}

\begin{equation}\frac{16x^{2}}{35} \times \frac{7}{64x^{5}}\end{equation}

\begin{equation}\frac{24}{8(x+6)} \times \frac{2(x+6)}{12}\end{equation}

\begin{equation}\frac{x+3}{8(x+5)} \times \frac{x+5}{x^{2}+13x+30}\end{equation}

\begin{equation}\frac{4x}{100x^{2}-1} \times \frac{10x^{2}+81x+8}{8}\end{equation}

\begin{equation}\frac{10(x+6)}{x^{2}+10x+24} \times (x+4)(x+2)\end{equation}

\begin{equation}\frac{30x^{2}y^{5}}{x^{3}} \times \frac{4x^{2}}{6y}\end{equation}

\begin{equation}\frac{49x^{2}}{18} \times \frac{9}{343x^{5}}\end{equation}

\begin{equation}\frac{9}{5(x+2)} \times (x^{2}+5x+6)\end{equation}

\begin{equation}\frac{9(x+8)}{6} \times \frac{36x}{x+8}\end{equation}

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