-12x-21=9-6x

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Solution for -12x-21=9-6x equation: 



-12x-21=9-6x

We move all terms to the left:

-12x-21-(9-6x)=0

We add all the numbers together, and all the variables

-12x-(-6x+9)-21=0

We get rid of parentheses

-12x+6x-9-21=0

We add all the numbers together, and all the variables

-6x-30=0

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

-6x=30

x=30/-6

x=-5

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