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-3x+6(x-8)=-81
We move all terms to the left:
-3x+6(x-8)-(-81)=0
We add all the numbers together, and all the variables
-3x+6(x-8)+81=0
We multiply parentheses
-3x+6x-48+81=0
We add all the numbers together, and all the variables
3x+33=0
We move all terms containing x to the left, all other terms to the right
3x=-33
x=-33/3
x=-11
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