The expression $\displaystyle {\left({x}-{7}\right)}{\left({x}^{{2}}+{7}{x}+{7}\right)}$equals $\displaystyle {A}{x}^{{3}}+{B}{x}^{{2}}+{C}{x}+{D}$
where $\displaystyle {A}$ equals:


and $\displaystyle {B}$ equals:


and $\displaystyle {C}$ equals:


and $\displaystyle {D}$ equals: