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259=104-u
We move all terms to the left:
259-(104-u)=0
We add all the numbers together, and all the variables
-(-1u+104)+259=0
We get rid of parentheses
1u-104+259=0
We add all the numbers together, and all the variables
u+155=0
We move all terms containing u to the left, all other terms to the right
u=-155
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