-21x=9+3x

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Solution for -21x=9+3x equation: 



-21x=9+3x

We move all terms to the left:

-21x-(9+3x)=0

We add all the numbers together, and all the variables

-21x-(3x+9)=0

We get rid of parentheses

-21x-3x-9=0

We add all the numbers together, and all the variables

-24x-9=0

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

-24x=9

x=9/-24

x=-3/8

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