Let $\displaystyle \lim_{{{x}\to-{3}}}{f{{\left({x}\right)}}}=-{8}$  and $\displaystyle \lim_{{{x}\to-{3}}}{g{{\left({x}\right)}}}={8}$ . Find $\displaystyle \lim_{{{x}\to-{3}}}{\left[{f{{\left({x}\right)}}}-{g{{\left({x}\right)}}}\right]}$ .