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360=2(a)+2(2a)
We move all terms to the left:
360-(2(a)+2(2a))=0
We add all the numbers together, and all the variables
-(+24a)+360=0
We get rid of parentheses
-24a+360=0
We move all terms containing a to the left, all other terms to the right
-24a=-360
a=-360/-24
a=+15
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