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38=-u+223
We move all terms to the left:
38-(-u+223)=0
We add all the numbers together, and all the variables
-(-1u+223)+38=0
We get rid of parentheses
1u-223+38=0
We add all the numbers together, and all the variables
u-185=0
We move all terms containing u to the left, all other terms to the right
u=185
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