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281=143-u
We move all terms to the left:
281-(143-u)=0
We add all the numbers together, and all the variables
-(-1u+143)+281=0
We get rid of parentheses
1u-143+281=0
We add all the numbers together, and all the variables
u+138=0
We move all terms containing u to the left, all other terms to the right
u=-138
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