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122.4=10.2a
We move all terms to the left:
122.4-(10.2a)=0
We add all the numbers together, and all the variables
-(+10.2a)+122.4=0
We get rid of parentheses
-10.2a+122.4=0
We move all terms containing a to the left, all other terms to the right
-10.2a=-122.4
a=-122.4/-10.2
a=12+1.4210854715202E-14/10.2
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