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23=3u-16
We move all terms to the left:
23-(3u-16)=0
We get rid of parentheses
-3u+16+23=0
We add all the numbers together, and all the variables
-3u+39=0
We move all terms containing u to the left, all other terms to the right
-3u=-39
u=-39/-3
u=+13
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