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64=2a.a=
We move all terms to the left:
64-(2a.a)=0
We add all the numbers together, and all the variables
-(+2a.a)+64=0
We get rid of parentheses
-2a.a+64=0
We move all terms containing a to the left, all other terms to the right
-2a.a=-64
a=-64/1
a=-64
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