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

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Solution for 3(2x+x)-3x=12. equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-3x+9x-12=0

We add all the numbers together, and all the variables

6x-12=0

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

6x=12

x=12/6

x=2

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