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228=171-u
We move all terms to the left:
228-(171-u)=0
We add all the numbers together, and all the variables
-(-1u+171)+228=0
We get rid of parentheses
1u-171+228=0
We add all the numbers together, and all the variables
u+57=0
We move all terms containing u to the left, all other terms to the right
u=-57
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