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162=89-u
We move all terms to the left:
162-(89-u)=0
We add all the numbers together, and all the variables
-(-1u+89)+162=0
We get rid of parentheses
1u-89+162=0
We add all the numbers together, and all the variables
u+73=0
We move all terms containing u to the left, all other terms to the right
u=-73
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