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-(5-3K)=7K+4
We move all terms to the left:
-(5-3K)-(7K+4)=0
We add all the numbers together, and all the variables
-(-3K+5)-(7K+4)=0
We get rid of parentheses
3K-7K-5-4=0
We add all the numbers together, and all the variables
-4K-9=0
We move all terms containing K to the left, all other terms to the right
-4K=9
K=9/-4
K=-2+1/4
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