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-42=3K+28
We move all terms to the left:
-42-(3K+28)=0
We get rid of parentheses
-3K-28-42=0
We add all the numbers together, and all the variables
-3K-70=0
We move all terms containing K to the left, all other terms to the right
-3K=70
K=70/-3
K=-23+1/3
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