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47=28-3u
We move all terms to the left:
47-(28-3u)=0
We add all the numbers together, and all the variables
-(-3u+28)+47=0
We get rid of parentheses
3u-28+47=0
We add all the numbers together, and all the variables
3u+19=0
We move all terms containing u to the left, all other terms to the right
3u=-19
u=-19/3
u=-6+1/3
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