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-1=8K-7K-1
We move all terms to the left:
-1-(8K-7K-1)=0
We add all the numbers together, and all the variables
-(K-1)-1=0
We get rid of parentheses
-K+1-1=0
We add all the numbers together, and all the variables
-K=0
K=0/-1
K=0
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