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28.5=a+3.1
We move all terms to the left:
28.5-(a+3.1)=0
We get rid of parentheses
-a-3.1+28.5=0
We add all the numbers together, and all the variables
-1a+25.4=0
We move all terms containing a to the left, all other terms to the right
-a=-25.4
a=-25.4/-1
a=25+0.4/1
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