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(3a)/7=9
We move all terms to the left:
(3a)/7-(9)=0
We multiply all the terms by the denominator
3a-9*7=0
We add all the numbers together, and all the variables
3a-63=0
We move all terms containing a to the left, all other terms to the right
3a=63
a=63/3
a=21
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