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-3(-6-3k)=99
We move all terms to the left:
-3(-6-3k)-(99)=0
We add all the numbers together, and all the variables
-3(-3k-6)-99=0
We multiply parentheses
9k+18-99=0
We add all the numbers together, and all the variables
9k-81=0
We move all terms containing k to the left, all other terms to the right
9k=81
k=81/9
k=9
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