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18=4u+5u
We move all terms to the left:
18-(4u+5u)=0
We add all the numbers together, and all the variables
-(+9u)+18=0
We get rid of parentheses
-9u+18=0
We move all terms containing u to the left, all other terms to the right
-9u=-18
u=-18/-9
u=+2
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