8k+9=9k-1

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Solution for 8k+9=9k-1 equation: 



8k+9=9k-1

We move all terms to the left:

8k+9-(9k-1)=0

We get rid of parentheses

8k-9k+1+9=0

We add all the numbers together, and all the variables

-1k+10=0

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

-k=-10

k=-10/-1

k=+10

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