12=x+x+3x-4

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



12=x+x+3x-4

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(5x-4)+12=0

We get rid of parentheses

-5x+4+12=0

We add all the numbers together, and all the variables

-5x+16=0

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

-5x=-16

x=-16/-5

x=3+1/5

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