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285=200-u
We move all terms to the left:
285-(200-u)=0
We add all the numbers together, and all the variables
-(-1u+200)+285=0
We get rid of parentheses
1u-200+285=0
We add all the numbers together, and all the variables
u+85=0
We move all terms containing u to the left, all other terms to the right
u=-85
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