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165=233-u
We move all terms to the left:
165-(233-u)=0
We add all the numbers together, and all the variables
-(-1u+233)+165=0
We get rid of parentheses
1u-233+165=0
We add all the numbers together, and all the variables
u-68=0
We move all terms containing u to the left, all other terms to the right
u=68
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