12=3u-1u

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Solution for 12=3u-1u equation: 



12=3u-1u

We move all terms to the left:

12-(3u-1u)=0

We add all the numbers together, and all the variables

-(+2u)+12=0

We get rid of parentheses

-2u+12=0

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

-2u=-12

u=-12/-2

u=+6

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