12=3+k

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Solution for 12=3+k equation: 



12=3+k

We move all terms to the left:

12-(3+k)=0

We add all the numbers together, and all the variables

-(k+3)+12=0

We get rid of parentheses

-k-3+12=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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