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241=100-u
We move all terms to the left:
241-(100-u)=0
We add all the numbers together, and all the variables
-(-1u+100)+241=0
We get rid of parentheses
1u-100+241=0
We add all the numbers together, and all the variables
u+141=0
We move all terms containing u to the left, all other terms to the right
u=-141
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