12=18-3u

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Solution for 12=18-3u equation: 



12=18-3u

We move all terms to the left:

12-(18-3u)=0

We add all the numbers together, and all the variables

-(-3u+18)+12=0

We get rid of parentheses

3u-18+12=0

We add all the numbers together, and all the variables

3u-6=0

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

3u=6

u=6/3

u=2

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