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6u=18+u
We move all terms to the left:
6u-(18+u)=0
We add all the numbers together, and all the variables
6u-(u+18)=0
We get rid of parentheses
6u-u-18=0
We add all the numbers together, and all the variables
5u-18=0
We move all terms containing u to the left, all other terms to the right
5u=18
u=18/5
u=3+3/5
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