12x-9=3x+18

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Solution for 12x-9=3x+18 equation: 



12x-9=3x+18

We move all terms to the left:

12x-9-(3x+18)=0

We get rid of parentheses

12x-3x-18-9=0

We add all the numbers together, and all the variables

9x-27=0

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

9x=27

x=27/9

x=3

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