3x-x=12+4x

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Solution for 3x-x=12+4x equation: 



3x-x=12+4x

We move all terms to the left:

3x-x-(12+4x)=0

We add all the numbers together, and all the variables

3x-x-(4x+12)=0

We add all the numbers together, and all the variables

2x-(4x+12)=0

We get rid of parentheses

2x-4x-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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