2x-12=3x+9

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Solution for 2x-12=3x+9 equation: 



2x-12=3x+9

We move all terms to the left:

2x-12-(3x+9)=0

We get rid of parentheses

2x-3x-9-12=0

We add all the numbers together, and all the variables

-1x-21=0

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

-x=21

x=21/-1

x=-21

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