-9x-9=x+21

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Solution for -9x-9=x+21 equation: 



-9x-9=x+21

We move all terms to the left:

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

We get rid of parentheses

-9x-x-21-9=0

We add all the numbers together, and all the variables

-10x-30=0

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

-10x=30

x=30/-10

x=-3

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