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3.25+1.25a=81
We move all terms to the left:
3.25+1.25a-(81)=0
We add all the numbers together, and all the variables
1.25a-77.75=0
We move all terms containing a to the left, all other terms to the right
1.25a=77.75
a=77.75/1.25
a=62+0.25/1.25
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