9=2k-k

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Solution for 9=2k-k equation: 



9=2k-k

We move all terms to the left:

9-(2k-k)=0

We add all the numbers together, and all the variables

-(+k)+9=0

We get rid of parentheses

-k+9=0

We add all the numbers together, and all the variables

-1k+9=0

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

-k=-9

k=-9/-1

k=+9

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