21=6(x+2)-3x

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Solution for 21=6(x+2)-3x equation: 



21=6(x+2)-3x

We move all terms to the left:

21-(6(x+2)-3x)=0



We calculate terms in parentheses: -(6(x+2)-3x), so:

6(x+2)-3x

We add all the numbers together, and all the variables

-3x+6(x+2)

We multiply parentheses

-3x+6x+12

We add all the numbers together, and all the variables

3x+12

Back to the equation:

-(3x+12)



We get rid of parentheses

-3x-12+21=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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