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2.8=a+5.5
We move all terms to the left:
2.8-(a+5.5)=0
We get rid of parentheses
-a-5.5+2.8=0
We add all the numbers together, and all the variables
-1a-2.7=0
We move all terms containing a to the left, all other terms to the right
-a=2.7
a=2.7/-1
a=-2+0.7/1
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