21=-3(x+11)

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Solution for 21=-3(x+11) equation: 



21=-3(x+11)

We move all terms to the left:

21-(-3(x+11))=0



We calculate terms in parentheses: -(-3(x+11)), so:

-3(x+11)

We multiply parentheses

-3x-33

Back to the equation:

-(-3x-33)



We get rid of parentheses

3x+33+21=0

We add all the numbers together, and all the variables

3x+54=0

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

3x=-54

x=-54/3

x=-18

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