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57=1+8k
We move all terms to the left:
57-(1+8k)=0
We add all the numbers together, and all the variables
-(8k+1)+57=0
We get rid of parentheses
-8k-1+57=0
We add all the numbers together, and all the variables
-8k+56=0
We move all terms containing k to the left, all other terms to the right
-8k=-56
k=-56/-8
k=+7
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