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(9a-15)=6
We move all terms to the left:
(9a-15)-(6)=0
We get rid of parentheses
9a-15-6=0
We add all the numbers together, and all the variables
9a-21=0
We move all terms containing a to the left, all other terms to the right
9a=21
a=21/9
a=2+1/3
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