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28=4.1+a
We move all terms to the left:
28-(4.1+a)=0
We add all the numbers together, and all the variables
-(a+4.1)+28=0
We get rid of parentheses
-a-4.1+28=0
We add all the numbers together, and all the variables
-1a+23.9=0
We move all terms containing a to the left, all other terms to the right
-a=-23.9
a=-23.9/-1
a=23+0.9/1
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