9=-6x-21

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Solution for 9=-6x-21 equation: 



9=-6x-21

We move all terms to the left:

9-(-6x-21)=0

We get rid of parentheses

6x+21+9=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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