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57=211-u
We move all terms to the left:
57-(211-u)=0
We add all the numbers together, and all the variables
-(-1u+211)+57=0
We get rid of parentheses
1u-211+57=0
We add all the numbers together, and all the variables
u-154=0
We move all terms containing u to the left, all other terms to the right
u=154
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