The expression $\displaystyle {\left({4}{x}^{{2}}-{6}{x}-{4}\right)}{\left({2}{x}^{{2}}-{10}{x}+{7}\right)}$ equals $\displaystyle {x}^{{4}}+$ $\displaystyle {x}^{{3}}+$ $\displaystyle {x}^{{2}}+$ $\displaystyle {x}+$