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2a-22.8=a-3.5=a+1.2
We move all terms to the left:
2a-22.8-(a-3.5)=0
We get rid of parentheses
2a-a+3.5-22.8=0
We add all the numbers together, and all the variables
a-19.3=0
We move all terms containing a to the left, all other terms to the right
a=19.3
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