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233=281-u
We move all terms to the left:
233-(281-u)=0
We add all the numbers together, and all the variables
-(-1u+281)+233=0
We get rid of parentheses
1u-281+233=0
We add all the numbers together, and all the variables
u-48=0
We move all terms containing u to the left, all other terms to the right
u=48
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