K=42-7c

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Solution for K=42-7c equation: 



=42-7K

We move all terms to the left:

-(42-7K)=0

We add all the numbers together, and all the variables

-(-7K+42)=0

We get rid of parentheses

7K-42=0

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

7K=42

K=42/7

K=6

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