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6a-7=3a+20.8
We move all terms to the left:
6a-7-(3a+20.8)=0
We get rid of parentheses
6a-3a-20.8-7=0
We add all the numbers together, and all the variables
3a-27.8=0
We move all terms containing a to the left, all other terms to the right
3a=27.8
a=27.8/3
a=9+0.8/3
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