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9(11-k)=3(3k-9)=
We move all terms to the left:
9(11-k)-(3(3k-9))=0
We add all the numbers together, and all the variables
9(-1k+11)-(3(3k-9))=0
We multiply parentheses
-9k-(3(3k-9))+99=0
We calculate terms in parentheses: -(3(3k-9)), so:We get rid of parentheses
3(3k-9)
We multiply parentheses
9k-27
Back to the equation:
-(9k-27)
-9k-9k+27+99=0
We add all the numbers together, and all the variables
-18k+126=0
We move all terms containing k to the left, all other terms to the right
-18k=-126
k=-126/-18
k=+7
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