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28.8-2u=3.2
We move all terms to the left:
28.8-2u-(3.2)=0
We add all the numbers together, and all the variables
-2u+25.6=0
We move all terms containing u to the left, all other terms to the right
-2u=-25.6
u=-25.6/-2
u=12+1/1.25
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