12+x=x-4x

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Solution for 12+x=x-4x equation: 



12+x=x-4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(-3x)+12=0

We get rid of parentheses

x+3x+12=0

We add all the numbers together, and all the variables

4x+12=0

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

4x=-12

x=-12/4

x=-3

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