3x+9=12x-9

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



3x+9=12x-9

We move all terms to the left:

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

We get rid of parentheses

3x-12x+9+9=0

We add all the numbers together, and all the variables

-9x+18=0

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

-9x=-18

x=-18/-9

x=+2

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