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253=1-u
We move all terms to the left:
253-(1-u)=0
We add all the numbers together, and all the variables
-(-1u+1)+253=0
We get rid of parentheses
1u-1+253=0
We add all the numbers together, and all the variables
u+252=0
We move all terms containing u to the left, all other terms to the right
u=-252
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