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2.3=a-10.9
We move all terms to the left:
2.3-(a-10.9)=0
We get rid of parentheses
-a+10.9+2.3=0
We add all the numbers together, and all the variables
-1a+13.2=0
We move all terms containing a to the left, all other terms to the right
-a=-13.2
a=-13.2/-1
a=13+0.2/1
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