12=6+-3u

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Solution for 12=6+-3u equation: 



12=6+-3u

We move all terms to the left:

12-(6+-3u)=0

We add all the numbers together, and all the variables

-(-3u)+12=0

We get rid of parentheses

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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