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4+7=7KK-1
We move all terms to the left:
4+7-(7KK-1)=0
We add all the numbers together, and all the variables
-(7KK-1)+11=0
We get rid of parentheses
-7KK+1+11=0
We add all the numbers together, and all the variables
-7KK+12=0
We move all terms containing K to the left, all other terms to the right
-7KK=-12
K=-12/1
K=-12
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