12x+72=3x-9

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Solution for 12x+72=3x-9 equation: 



12x+72=3x-9

We move all terms to the left:

12x+72-(3x-9)=0

We get rid of parentheses

12x-3x+9+72=0

We add all the numbers together, and all the variables

9x+81=0

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

9x=-81

x=-81/9

x=-9

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