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250=209-u
We move all terms to the left:
250-(209-u)=0
We add all the numbers together, and all the variables
-(-1u+209)+250=0
We get rid of parentheses
1u-209+250=0
We add all the numbers together, and all the variables
u+41=0
We move all terms containing u to the left, all other terms to the right
u=-41
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