3x+x=12+x

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



3x+x=12+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

4x-(x+12)=0

We get rid of parentheses

4x-x-12=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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