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(a/2)-84=
We move all terms to the left:
(a/2)-84-()=0
We add all the numbers together, and all the variables
(+a/2)-84-()=0
We add all the numbers together, and all the variables
(+a/2)=0
We get rid of parentheses
a/2=0
We multiply all the terms by the denominator
a=0
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