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28=3u+10
We move all terms to the left:
28-(3u+10)=0
We get rid of parentheses
-3u-10+28=0
We add all the numbers together, and all the variables
-3u+18=0
We move all terms containing u to the left, all other terms to the right
-3u=-18
u=-18/-3
u=+6
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