-3u-6=21

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Solution for -3u-6=21 equation: 



-3u-6=21

We move all terms to the left:

-3u-6-(21)=0

We add all the numbers together, and all the variables

-3u-27=0

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

-3u=27

u=27/-3

u=-9

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