21=9+6x

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Solution for 21=9+6x equation: 



21=9+6x

We move all terms to the left:

21-(9+6x)=0

We add all the numbers together, and all the variables

-(6x+9)+21=0

We get rid of parentheses

-6x-9+21=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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