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24.4=3.9a
We move all terms to the left:
24.4-(3.9a)=0
We add all the numbers together, and all the variables
-(+3.9a)+24.4=0
We get rid of parentheses
-3.9a+24.4=0
We move all terms containing a to the left, all other terms to the right
-3.9a=-24.4
a=-24.4/-3.9
a=6+1/3.9
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