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10=255-u
We move all terms to the left:
10-(255-u)=0
We add all the numbers together, and all the variables
-(-1u+255)+10=0
We get rid of parentheses
1u-255+10=0
We add all the numbers together, and all the variables
u-245=0
We move all terms containing u to the left, all other terms to the right
u=245
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