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-3(x-6)-6x=-81
We move all terms to the left:
-3(x-6)-6x-(-81)=0
We add all the numbers together, and all the variables
-6x-3(x-6)+81=0
We multiply parentheses
-6x-3x+18+81=0
We add all the numbers together, and all the variables
-9x+99=0
We move all terms containing x to the left, all other terms to the right
-9x=-99
x=-99/-9
x=+11
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