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28=15u-8u
We move all terms to the left:
28-(15u-8u)=0
We add all the numbers together, and all the variables
-(+7u)+28=0
We get rid of parentheses
-7u+28=0
We move all terms containing u to the left, all other terms to the right
-7u=-28
u=-28/-7
u=+4
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