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248=46-u
We move all terms to the left:
248-(46-u)=0
We add all the numbers together, and all the variables
-(-1u+46)+248=0
We get rid of parentheses
1u-46+248=0
We add all the numbers together, and all the variables
u+202=0
We move all terms containing u to the left, all other terms to the right
u=-202
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