21=-3(x+3)

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



21=-3(x+3)

We move all terms to the left:

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



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

-3(x+3)

We multiply parentheses

-3x-9

Back to the equation:

-(-3x-9)



We get rid of parentheses

3x+9+21=0

We add all the numbers together, and all the variables

3x+30=0

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

3x=-30

x=-30/3

x=-10

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