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278=208-u
We move all terms to the left:
278-(208-u)=0
We add all the numbers together, and all the variables
-(-1u+208)+278=0
We get rid of parentheses
1u-208+278=0
We add all the numbers together, and all the variables
u+70=0
We move all terms containing u to the left, all other terms to the right
u=-70
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