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4+-4+-3K=13-7K-1+8
We move all terms to the left:
4+-4+-3K-(13-7K-1+8)=0
We add all the numbers together, and all the variables
-3K-(-7K+20)+4-4++=0
We add all the numbers together, and all the variables
-3K-(-7K+20)=0
We get rid of parentheses
-3K+7K-20=0
We add all the numbers together, and all the variables
4K-20=0
We move all terms containing K to the left, all other terms to the right
4K=20
K=20/4
K=5
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