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258=203-u
We move all terms to the left:
258-(203-u)=0
We add all the numbers together, and all the variables
-(-1u+203)+258=0
We get rid of parentheses
1u-203+258=0
We add all the numbers together, and all the variables
u+55=0
We move all terms containing u to the left, all other terms to the right
u=-55
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