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18=6u-4u
We move all terms to the left:
18-(6u-4u)=0
We add all the numbers together, and all the variables
-(+2u)+18=0
We get rid of parentheses
-2u+18=0
We move all terms containing u to the left, all other terms to the right
-2u=-18
u=-18/-2
u=+9
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