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23+18u=21u+14
We move all terms to the left:
23+18u-(21u+14)=0
We get rid of parentheses
18u-21u-14+23=0
We add all the numbers together, and all the variables
-3u+9=0
We move all terms containing u to the left, all other terms to the right
-3u=-9
u=-9/-3
u=+3
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