u+12=3u-6

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Solution for u+12=3u-6 equation: 



u+12=3u-6

We move all terms to the left:

u+12-(3u-6)=0

We get rid of parentheses

u-3u+6+12=0

We add all the numbers together, and all the variables

-2u+18=0

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

-2u=-18

u=-18/-2

u=+9

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