18=12u-6u

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Solution for 18=12u-6u equation: 



18=12u-6u

We move all terms to the left:

18-(12u-6u)=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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