9=21-6x

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Solution for 9=21-6x equation: 



9=21-6x

We move all terms to the left:

9-(21-6x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x-21+9=0

We add all the numbers together, and all the variables

6x-12=0

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

6x=12

x=12/6

x=2

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