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155=93-u
We move all terms to the left:
155-(93-u)=0
We add all the numbers together, and all the variables
-(-1u+93)+155=0
We get rid of parentheses
1u-93+155=0
We add all the numbers together, and all the variables
u+62=0
We move all terms containing u to the left, all other terms to the right
u=-62
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