Answer
$1$
Work Step by Step
$\frac{-6}{-6}=1$
We know this, because any number divided by itself equals one. (i.e. $\frac{4}{4}=1, \frac{221}{221}=1, \frac{a}{a}=1$)
We also know that since there are an even number of negative signs, the answer will be positive.
