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283=83-u
We move all terms to the left:
283-(83-u)=0
We add all the numbers together, and all the variables
-(-1u+83)+283=0
We get rid of parentheses
1u-83+283=0
We add all the numbers together, and all the variables
u+200=0
We move all terms containing u to the left, all other terms to the right
u=-200
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