9=12+3x-30

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Solution for 9=12+3x-30 equation: 



9=12+3x-30

We move all terms to the left:

9-(12+3x-30)=0

We add all the numbers together, and all the variables

-(3x-18)+9=0

We get rid of parentheses

-3x+18+9=0

We add all the numbers together, and all the variables

-3x+27=0

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

-3x=-27

x=-27/-3

x=+9

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