K+13=x+21

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Solution for K+13=x+21 equation: 



+13=K+21

We move all terms to the left:

+13-(K+21)=0

We get rid of parentheses

-K-21+13=0

We add all the numbers together, and all the variables

-1K-8=0

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

-K=8

K=8/-1

K=-8

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