what is the tangent slope of the f(x)= $\displaystyle \frac{5}{x}$ at the point (-2, $\displaystyle \frac{-5}{2}$) using the formula lim x->a $\displaystyle \frac{f(x)-f(a)}{x-a}$

$\displaystyle \frac{\frac{5}{x}-(-\frac{5}{2})}{x-(-2)}$

i get two here and i am stuck

$\displaystyle \frac{\frac{5}{x}+(\frac{5}{2})}{x+2}$

I can see that I can potentially cancel out the (x+2)but I am not sure.