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+7=21+2K
We move all terms to the left:
+7-(21+2K)=0
We add all the numbers together, and all the variables
-(2K+21)+7=0
We get rid of parentheses
-2K-21+7=0
We add all the numbers together, and all the variables
-2K-14=0
We move all terms containing K to the left, all other terms to the right
-2K=14
K=14/-2
K=-7
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