Expand the expression using the Binomial Theorem:
$\displaystyle {\left({2}{x}+-{1}\right)}^{{5}}=$ $\displaystyle {x}^{{5}}+$ $\displaystyle {x}^{{4}}+$ $\displaystyle {x}^{{3}}+$ $\displaystyle {x}^{{2}}+$ $\displaystyle {x}+$