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4+7(2K+1)=40+7K
We move all terms to the left:
4+7(2K+1)-(40+7K)=0
We add all the numbers together, and all the variables
7(2K+1)-(7K+40)+4=0
We multiply parentheses
14K-(7K+40)+7+4=0
We get rid of parentheses
14K-7K-40+7+4=0
We add all the numbers together, and all the variables
7K-29=0
We move all terms containing K to the left, all other terms to the right
7K=29
K=29/7
K=4+1/7
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