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18.4a-3.1=16.4a+16.9
We move all terms to the left:
18.4a-3.1-(16.4a+16.9)=0
We get rid of parentheses
18.4a-16.4a-16.9-3.1=0
We add all the numbers together, and all the variables
2a-20=0
We move all terms containing a to the left, all other terms to the right
2a=20
a=20/2
a=10
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