<s>[INST] Performing and simplifying equations 
The expression is $$\frac {5}{x-2} - \frac 3{x+7} + 2$$
I need to simplify it too.

 [/INST] $$\frac {5}{x-2} - \frac 3{x+7} + 2$$
Find the common denominator!
$$\begin{align}\frac {5}{x-2} - \frac 3{x+7} + 2 & = \dfrac{5(x+7)}{(x - 2)(x+ 7)} - \dfrac{3(x - 2)}{(x-2)(x+7)} + \frac{2(x-2)(x+7)}{(x-2)(x+7)} \\ \\& =\dfrac{5(x+7) - 3(x-2) + 2(x-2)(x+7)}{(x - 2)(x+7)} \\ \\ \end{align}$$
Now, expand the numerator, factor it if you can, cancel any like factors, i.e., simplify.
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