Answer
It does not make sense
Work Step by Step
We notice that in the given expression
$$E=\dfrac{5}{x-7}+\dfrac{3}{7-x}$$
the denominators are opposite. In this case the fastest way to perform the addition is to factor out $-1$ from one of the denominators:
$$E=\dfrac{5}{x-7}+\dfrac{3}{-(x-7)}=\dfrac{5}{x-7}+\dfrac{-3}{x-7}=\dfrac{5-3}{x-7}=\dfrac{2}{x-7}.$$
Therefore the given statement doesn't make sense.
