3=u-9

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Solution for 3=u-9 equation: 



3=u-9

We move all terms to the left:

3-(u-9)=0

We get rid of parentheses

-u+9+3=0

We add all the numbers together, and all the variables

-1u+12=0

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

-u=-12

u=-12/-1

u=+12

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