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64.4=4.6a
We move all terms to the left:
64.4-(4.6a)=0
We add all the numbers together, and all the variables
-(+4.6a)+64.4=0
We get rid of parentheses
-4.6a+64.4=0
We move all terms containing a to the left, all other terms to the right
-4.6a=-64.4
a=-64.4/-4.6
a=14+1.4210854715202E-14/4.6
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