Evaluate the following limits.

(a)$\displaystyle \lim_{{{x}\to\infty}}\ {\frac{{{7}}}{{{e}^{{x}}+{1}}}}=$
Preview Question 6 Part 1 of 2  

(b)$\displaystyle \lim_{{{x}\to-\infty}}\ {\frac{{{7}}}{{{e}^{{x}}+{1}}}}=$
Preview Question 6 Part 2 of 2  

[NOTE: If needed, enter oo for $\displaystyle \infty$ and -oo for $\displaystyle -\infty$.]