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200=116-u
We move all terms to the left:
200-(116-u)=0
We add all the numbers together, and all the variables
-(-1u+116)+200=0
We get rid of parentheses
1u-116+200=0
We add all the numbers together, and all the variables
u+84=0
We move all terms containing u to the left, all other terms to the right
u=-84
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