89=8-9k

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Solution for 89=8-9k equation: 



89=8-9k

We move all terms to the left:

89-(8-9k)=0

We add all the numbers together, and all the variables

-(-9k+8)+89=0

We get rid of parentheses

9k-8+89=0

We add all the numbers together, and all the variables

9k+81=0

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

9k=-81

k=-81/9

k=-9

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