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9(6a+3)=81
We move all terms to the left:
9(6a+3)-(81)=0
We multiply parentheses
54a+27-81=0
We add all the numbers together, and all the variables
54a-54=0
We move all terms containing a to the left, all other terms to the right
54a=54
a=54/54
a=1
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