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186=123-u
We move all terms to the left:
186-(123-u)=0
We add all the numbers together, and all the variables
-(-1u+123)+186=0
We get rid of parentheses
1u-123+186=0
We add all the numbers together, and all the variables
u+63=0
We move all terms containing u to the left, all other terms to the right
u=-63
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