Answer
0
Work Step by Step
$\frac{5}{a-7}$+$\frac{5}{7-a}$=
$\frac{5}{a-7}$+$\frac{5(-1)}{(7-a)(-1)}$=
$\frac{5}{a-7}$+$\frac{-5}{a-7}$=
$\frac{5-5}{a-7}$=0
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