-3u=12-u

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Solution for -3u=12-u equation: 



-3u=12-u

We move all terms to the left:

-3u-(12-u)=0

We add all the numbers together, and all the variables

-3u-(-1u+12)=0

We get rid of parentheses

-3u+1u-12=0

We add all the numbers together, and all the variables

-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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