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-9(6a+9)=-81
We move all terms to the left:
-9(6a+9)-(-81)=0
We add all the numbers together, and all the variables
-9(6a+9)+81=0
We multiply parentheses
-54a-81+81=0
We add all the numbers together, and all the variables
-54a=0
a=0/-54
a=0
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