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2.8=a-3.4
We move all terms to the left:
2.8-(a-3.4)=0
We get rid of parentheses
-a+3.4+2.8=0
We add all the numbers together, and all the variables
-1a+6.2=0
We move all terms containing a to the left, all other terms to the right
-a=-6.2
a=-6.2/-1
a=6+0.2/1
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