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177=80-u
We move all terms to the left:
177-(80-u)=0
We add all the numbers together, and all the variables
-(-1u+80)+177=0
We get rid of parentheses
1u-80+177=0
We add all the numbers together, and all the variables
u+97=0
We move all terms containing u to the left, all other terms to the right
u=-97
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