18=4u+5u

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Solution for 18=4u+5u equation: 



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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