-3u-6=-6u-21

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Solution for -3u-6=-6u-21 equation: 



-3u-6=-6u-21

We move all terms to the left:

-3u-6-(-6u-21)=0

We get rid of parentheses

-3u+6u+21-6=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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