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8^-6k-7=8^k+7

We move all terms to the left:

8^-6k-7-(8^k+7)=0

We add all the numbers together, and all the variables

-6k-(8^k+7)=0

We get rid of parentheses

-6k-8^k-7=0

We move all terms containing k to the left, all other terms to the right

-6k-8^k=7

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