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+5-1=K-5

We move all terms to the left:

+5-1-(K-5)=0

We add all the numbers together, and all the variables

-(K-5)+4=0

We get rid of parentheses

-K+5+4=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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