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-2=-+u
We move all terms to the left:
-2-(-+u)=0
We add all the numbers together, and all the variables
-(+u)-2=0
We get rid of parentheses
-u-2=0
We add all the numbers together, and all the variables
-1u-2=0
We move all terms containing u to the left, all other terms to the right
-u=2
u=2/-1
u=-2
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