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4=8-K
We move all terms to the left:
4-(8-K)=0
We add all the numbers together, and all the variables
-(-1K+8)+4=0
We get rid of parentheses
1K-8+4=0
We add all the numbers together, and all the variables
K-4=0
We move all terms containing K to the left, all other terms to the right
K=4
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