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