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(3k+27)+(3k+27)=9k+81
We move all terms to the left:
(3k+27)+(3k+27)-(9k+81)=0
We get rid of parentheses
3k+3k-9k+27+27-81=0
We add all the numbers together, and all the variables
-3k-27=0
We move all terms containing k to the left, all other terms to the right
-3k=27
k=27/-3
k=-9
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