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