Suppose f(x)=x3x214x30\displaystyle {f{{\left({x}\right)}}}={x}^{{3}}-{x}^{{2}}-{14}{x}-{30}, g(x)=x5\displaystyle {g{{\left({x}\right)}}}={x}-{5}. Find and simplify

(fg)(x)=\displaystyle {\left(\frac{{f}}{{g}}\right)}{\left({x}\right)}=