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u+u=u+0=u.
We move all terms to the left:
u+u-(u+0)=0
We add all the numbers together, and all the variables
u+u-(+u)=0
We add all the numbers together, and all the variables
2u-(+u)=0
We get rid of parentheses
2u-u=0
We add all the numbers together, and all the variables
u=0
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