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