u=18-2u

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Solution for u=18-2u equation: 



u=18-2u

We move all terms to the left:

u-(18-2u)=0

We add all the numbers together, and all the variables

u-(-2u+18)=0

We get rid of parentheses

u+2u-18=0

We add all the numbers together, and all the variables

3u-18=0

We move all terms containing u to the left, all other terms to the right

3u=18

u=18/3

u=6

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