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8.1=0.9aa=
We move all terms to the left:
8.1-(0.9aa)=0
We add all the numbers together, and all the variables
-(+0.9aa)+8.1=0
We get rid of parentheses
-0.9aa+8.1=0
We move all terms containing a to the left, all other terms to the right
-0.9aa=-8.1
a=-8.1/1
a=-8.1
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