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28=6u+4
We move all terms to the left:
28-(6u+4)=0
We get rid of parentheses
-6u-4+28=0
We add all the numbers together, and all the variables
-6u+24=0
We move all terms containing u to the left, all other terms to the right
-6u=-24
u=-24/-6
u=+4
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