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83=-u+200
We move all terms to the left:
83-(-u+200)=0
We add all the numbers together, and all the variables
-(-1u+200)+83=0
We get rid of parentheses
1u-200+83=0
We add all the numbers together, and all the variables
u-117=0
We move all terms containing u to the left, all other terms to the right
u=117
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