12=x+3x-4

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



12=x+3x-4

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(4x-4)+12=0

We get rid of parentheses

-4x+4+12=0

We add all the numbers together, and all the variables

-4x+16=0

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

-4x=-16

x=-16/-4

x=+4

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