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=-9-2K
We move all terms to the left:
-(-9-2K)=0
We add all the numbers together, and all the variables
-(-2K-9)=0
We get rid of parentheses
2K+9=0
We move all terms containing K to the left, all other terms to the right
2K=-9
K=-9/2
K=-4+1/2
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