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

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



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

We move all terms to the left:

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



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

-6x+3(x+6)

We multiply parentheses

-6x+3x+18

We add all the numbers together, and all the variables

-3x+18

Back to the equation:

-(-3x+18)



We get rid of parentheses

3x-18+21=0

We add all the numbers together, and all the variables

3x+3=0

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

3x=-3

x=-3/3

x=-1

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