3x+9=12x-6x-30

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Solution for 3x+9=12x-6x-30 equation: 



3x+9=12x-6x-30

We move all terms to the left:

3x+9-(12x-6x-30)=0

We add all the numbers together, and all the variables

3x-(6x-30)+9=0

We get rid of parentheses

3x-6x+30+9=0

We add all the numbers together, and all the variables

-3x+39=0

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

-3x=-39

x=-39/-3

x=+13

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