Given f(x)=6x+2\displaystyle {f{{\left({x}\right)}}}={6}{x}+{2} and g(x)=x+2\displaystyle {g{{\left({x}\right)}}}=\sqrt{{{x}}}+{2}, find f(g1(x))=\displaystyle {f{{\left({{g}^{{-{{1}}}}{\left({x}\right)}}\right)}}}= .