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8.1a+10=99.1
We move all terms to the left:
8.1a+10-(99.1)=0
We add all the numbers together, and all the variables
8.1a-89.1=0
We move all terms containing a to the left, all other terms to the right
8.1a=89.1
a=89.1/8.1
a=11
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