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-4x+12=x+14+x

We move all terms to the left:

-4x+12-(x+14+x)=0

We add all the numbers together, and all the variables

-4x-(2x+14)+12=0

We get rid of parentheses

-4x-2x-14+12=0

We add all the numbers together, and all the variables

-6x-2=0

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

-6x=2

x=2/-6

x=-1/3

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