6=7+8-k

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Solution for 6=7+8-k equation: 



6=7+8-k

We move all terms to the left:

6-(7+8-k)=0

We add all the numbers together, and all the variables

-(-1k+15)+6=0

We get rid of parentheses

1k-15+6=0

We add all the numbers together, and all the variables

k-9=0

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

k=9

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