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=-25+2K
We move all terms to the left:
-(-25+2K)=0
We add all the numbers together, and all the variables
-(2K-25)=0
We get rid of parentheses
-2K+25=0
We move all terms containing K to the left, all other terms to the right
-2K=-25
K=-25/-2
K=12+1/2
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