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