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18=7u-u=
We move all terms to the left:
18-(7u-u)=0
We add all the numbers together, and all the variables
-(+6u)+18=0
We get rid of parentheses
-6u+18=0
We move all terms containing u to the left, all other terms to the right
-6u=-18
u=-18/-6
u=+3
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