Answer:
k = -3
Explanation:
This one is quite easy once you know how to achive this:
What you want to to is first add 5k to both sides
-8k + 5k = -5k + 5k + 9
This eliminates the 5k leaving
-3k = 9
And since you can't have a negative exponent, times both sides by -1
-3k x -1 = 9 x -1
3k = -9
Now divide both sides by 3 to get the answer
3k/3 = -9/3
k = -3
and thats the answer.
Hope this helps and have a great day!