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240=118-u
We move all terms to the left:
240-(118-u)=0
We add all the numbers together, and all the variables
-(-1u+118)+240=0
We get rid of parentheses
1u-118+240=0
We add all the numbers together, and all the variables
u+122=0
We move all terms containing u to the left, all other terms to the right
u=-122
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