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

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Solution for 3(x+x)=3x-x+12 equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(+2x)-(2x+12)=0

We multiply parentheses

6x-(2x+12)=0

We get rid of parentheses

6x-2x-12=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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