3-9u=-7u+9

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Solution for 3-9u=-7u+9 equation: 



3-9u=-7u+9

We move all terms to the left:

3-9u-(-7u+9)=0

We get rid of parentheses

-9u+7u-9+3=0

We add all the numbers together, and all the variables

-2u-6=0

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

-2u=6

u=6/-2

u=-3

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