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162=57-u
We move all terms to the left:
162-(57-u)=0
We add all the numbers together, and all the variables
-(-1u+57)+162=0
We get rid of parentheses
1u-57+162=0
We add all the numbers together, and all the variables
u+105=0
We move all terms containing u to the left, all other terms to the right
u=-105
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