To perform the subtraction \(-8k - (-8k)\), you can first recognize that subtracting a negative number is equivalent to adding a positive number. Therefore, you can rewrite the expression as:
\[ -8k + 8k \]
Now, when you combine the like terms, you have:
\[ -8k + 8k = 0 \]
So, the result of the operation \( -8k - (-8k) \) is \( 0 \).