13=k+9

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Solution for 13=k+9 equation: 



13=k+9

We move all terms to the left:

13-(k+9)=0

We get rid of parentheses

-k-9+13=0

We add all the numbers together, and all the variables

-1k+4=0

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

-k=-4

k=-4/-1

k=+4

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