Express the function h(x)=(x+2)7\displaystyle {h}{\left({x}\right)}={\left({x}+{2}\right)}^{{7}} in the form fg\displaystyle {f}\circ{g}. If f(x)=x7\displaystyle {f{{\left({x}\right)}}}={x}^{{7}}, find the function g(x)\displaystyle {g{{\left({x}\right)}}}.
Your answer is g(x)\displaystyle {g{{\left({x}\right)}}}=   ,