6+3u=-9

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Solution for 6+3u=-9 equation: 



6+3u=-9

We move all terms to the left:

6+3u-(-9)=0

We add all the numbers together, and all the variables

3u+15=0

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

3u=-15

u=-15/3

u=-5

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