-x=12-4x

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Solution for -x=12-4x equation: 



-x=12-4x

We move all terms to the left:

-x-(12-4x)=0

We add all the numbers together, and all the variables

-x-(-4x+12)=0

We add all the numbers together, and all the variables

-1x-(-4x+12)=0

We get rid of parentheses

-1x+4x-12=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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