3x+3(-2x)=12-x

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Solution for 3x+3(-2x)=12-x equation: 



3x+3(-2x)=12-x

We move all terms to the left:

3x+3(-2x)-(12-x)=0

We add all the numbers together, and all the variables

3x+3(-2x)-(-1x+12)=0

We multiply parentheses

3x-6x-(-1x+12)=0

We get rid of parentheses

3x-6x+1x-12=0

We add all the numbers together, and all the variables

-2x-12=0

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

-2x=12

x=12/-2

x=-6

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