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43=8k-13
We move all terms to the left:
43-(8k-13)=0
We get rid of parentheses
-8k+13+43=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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