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(12a-14)-(3a+-9)=0
We add all the numbers together, and all the variables
(12a-14)-(3a-9)=0
We get rid of parentheses
12a-3a-14+9=0
We add all the numbers together, and all the variables
9a-5=0
We move all terms containing a to the left, all other terms to the right
9a=5
a=5/9
a=5/9
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