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242=113-u
We move all terms to the left:
242-(113-u)=0
We add all the numbers together, and all the variables
-(-1u+113)+242=0
We get rid of parentheses
1u-113+242=0
We add all the numbers together, and all the variables
u+129=0
We move all terms containing u to the left, all other terms to the right
u=-129
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