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2a-19.8=a+1.2
We move all terms to the left:
2a-19.8-(a+1.2)=0
We get rid of parentheses
2a-a-1.2-19.8=0
We add all the numbers together, and all the variables
a-21=0
We move all terms containing a to the left, all other terms to the right
a=21
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