9x-12=21-2x

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Solution for 9x-12=21-2x equation: 



9x-12=21-2x

We move all terms to the left:

9x-12-(21-2x)=0

We add all the numbers together, and all the variables

9x-(-2x+21)-12=0

We get rid of parentheses

9x+2x-21-12=0

We add all the numbers together, and all the variables

11x-33=0

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

11x=33

x=33/11

x=3

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