12-u=2u

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Solution for 12-u=2u equation: 



12-u=2u

We move all terms to the left:

12-u-(2u)=0

We add all the numbers together, and all the variables

-3u+12=0

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

-3u=-12

u=-12/-3

u=+4

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