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253=184-u
We move all terms to the left:
253-(184-u)=0
We add all the numbers together, and all the variables
-(-1u+184)+253=0
We get rid of parentheses
1u-184+253=0
We add all the numbers together, and all the variables
u+69=0
We move all terms containing u to the left, all other terms to the right
u=-69
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