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186=247-u
We move all terms to the left:
186-(247-u)=0
We add all the numbers together, and all the variables
-(-1u+247)+186=0
We get rid of parentheses
1u-247+186=0
We add all the numbers together, and all the variables
u-61=0
We move all terms containing u to the left, all other terms to the right
u=61
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