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3(3a+4)=84
We move all terms to the left:
3(3a+4)-(84)=0
We multiply parentheses
9a+12-84=0
We add all the numbers together, and all the variables
9a-72=0
We move all terms containing a to the left, all other terms to the right
9a=72
a=72/9
a=8
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