Answer:
7k
Explanation:
-k - (-8k)
if there is "-" in front on an inner form, change the sign of each quarter to the form.
-k + 8k
Simplify similar tribes with add or subtract.
= 7k
-k - -(8k): the - sign cancels out the - in 8k so it would only leave -k+8k=7k
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