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(a+6)()=6a+12
We move all terms to the left:
(a+6)()-(6a+12)=0
We get rid of parentheses
(a+6)()-6a-12=0
We add all the numbers together, and all the variables
-6a+(a+6)()-12=0
We move all terms containing a to the left, all other terms to the right
-6a+(a+6)()=12
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