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8=3k-13
We move all terms to the left:
8-(3k-13)=0
We get rid of parentheses
-3k+13+8=0
We add all the numbers together, and all the variables
-3k+21=0
We move all terms containing k to the left, all other terms to the right
-3k=-21
k=-21/-3
k=+7
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