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-(u-56)=-34
We move all terms to the left:
-(u-56)-(-34)=0
We add all the numbers together, and all the variables
-(u-56)+34=0
We get rid of parentheses
-u+56+34=0
We add all the numbers together, and all the variables
-1u+90=0
We move all terms containing u to the left, all other terms to the right
-u=-90
u=-90/-1
u=+90
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