2k-9=12+5k

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Solution for 2k-9=12+5k equation: 



2k-9=12+5k

We move all terms to the left:

2k-9-(12+5k)=0

We add all the numbers together, and all the variables

2k-(5k+12)-9=0

We get rid of parentheses

2k-5k-12-9=0

We add all the numbers together, and all the variables

-3k-21=0

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

-3k=21

k=21/-3

k=-7

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