x+x=4+8+x

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Solution for x+x=4+8+x equation: 



x+x=4+8+x

We move all terms to the left:

x+x-(4+8+x)=0

We add all the numbers together, and all the variables

x+x-(x+12)=0

We add all the numbers together, and all the variables

2x-(x+12)=0

We get rid of parentheses

2x-x-12=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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