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4-25=6K+12
We move all terms to the left:
4-25-(6K+12)=0
We add all the numbers together, and all the variables
-(6K+12)-21=0
We get rid of parentheses
-6K-12-21=0
We add all the numbers together, and all the variables
-6K-33=0
We move all terms containing K to the left, all other terms to the right
-6K=33
K=33/-6
K=-5+1/2
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