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285=19-u
We move all terms to the left:
285-(19-u)=0
We add all the numbers together, and all the variables
-(-1u+19)+285=0
We get rid of parentheses
1u-19+285=0
We add all the numbers together, and all the variables
u+266=0
We move all terms containing u to the left, all other terms to the right
u=-266
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