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28=4+8U
We move all terms to the left:
28-(4+8U)=0
We add all the numbers together, and all the variables
-(8U+4)+28=0
We get rid of parentheses
-8U-4+28=0
We add all the numbers together, and all the variables
-8U+24=0
We move all terms containing U to the left, all other terms to the right
-8U=-24
U=-24/-8
U=+3
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