9x-21=6x+6

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Solution for 9x-21=6x+6 equation: 



9x-21=6x+6

We move all terms to the left:

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

We get rid of parentheses

9x-6x-6-21=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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