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4=13-3K
We move all terms to the left:
4-(13-3K)=0
We add all the numbers together, and all the variables
-(-3K+13)+4=0
We get rid of parentheses
3K-13+4=0
We add all the numbers together, and all the variables
3K-9=0
We move all terms containing K to the left, all other terms to the right
3K=9
K=9/3
K=3
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