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-3k+9=81+6k
We move all terms to the left:
-3k+9-(81+6k)=0
We add all the numbers together, and all the variables
-3k-(6k+81)+9=0
We get rid of parentheses
-3k-6k-81+9=0
We add all the numbers together, and all the variables
-9k-72=0
We move all terms containing k to the left, all other terms to the right
-9k=72
k=72/-9
k=-8
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