-6x-21=+3x

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Solution for -6x-21=+3x equation: 



-6x-21=+3x

We move all terms to the left:

-6x-21-(+3x)=0

We get rid of parentheses

-6x-3x-21=0

We add all the numbers together, and all the variables

-9x-21=0

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

-9x=21

x=21/-9

x=-2+1/3

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