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-9k=-8k+18
We move all terms to the left:
-9k-(-8k+18)=0
We get rid of parentheses
-9k+8k-18=0
We add all the numbers together, and all the variables
-1k-18=0
We move all terms containing k to the left, all other terms to the right
-k=18
k=18/-1
k=-18
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