12=3(2x+1)+3x

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Solution for 12=3(2x+1)+3x equation: 



12=3(2x+1)+3x

We move all terms to the left:

12-(3(2x+1)+3x)=0



We calculate terms in parentheses: -(3(2x+1)+3x), so:

3(2x+1)+3x

We add all the numbers together, and all the variables

3x+3(2x+1)

We multiply parentheses

3x+6x+3

We add all the numbers together, and all the variables

9x+3

Back to the equation:

-(9x+3)



We get rid of parentheses

-9x-3+12=0

We add all the numbers together, and all the variables

-9x+9=0

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

-9x=-9

x=-9/-9

x=1

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