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-9k-13=-8k
We move all terms to the left:
-9k-13-(-8k)=0
We get rid of parentheses
-9k+8k-13=0
We add all the numbers together, and all the variables
-1k-13=0
We move all terms containing k to the left, all other terms to the right
-k=13
k=13/-1
k=-13
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