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+8=2K+4
We move all terms to the left:
+8-(2K+4)=0
We get rid of parentheses
-2K-4+8=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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