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2a-21.6=a+2.6
We move all terms to the left:
2a-21.6-(a+2.6)=0
We get rid of parentheses
2a-a-2.6-21.6=0
We add all the numbers together, and all the variables
a-24.2=0
We move all terms containing a to the left, all other terms to the right
a=24.2
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