3+3u=-9+9u

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



3+3u=-9+9u

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3u-9u+9+3=0

We add all the numbers together, and all the variables

-6u+12=0

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

-6u=-12

u=-12/-6

u=+2

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