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-20=3+u
We move all terms to the left:
-20-(3+u)=0
We add all the numbers together, and all the variables
-(u+3)-20=0
We get rid of parentheses
-u-3-20=0
We add all the numbers together, and all the variables
-1u-23=0
We move all terms containing u to the left, all other terms to the right
-u=23
u=23/-1
u=-23
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