9=u+3

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Solution for 9=u+3 equation: 



9=u+3

We move all terms to the left:

9-(u+3)=0

We get rid of parentheses

-u-3+9=0

We add all the numbers together, and all the variables

-1u+6=0

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

-u=-6

u=-6/-1

u=+6

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