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159=-u+256
We move all terms to the left:
159-(-u+256)=0
We add all the numbers together, and all the variables
-(-1u+256)+159=0
We get rid of parentheses
1u-256+159=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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