-21=3(x+6)

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



-21=3(x+6)

We move all terms to the left:

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



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

3(x+6)

We multiply parentheses

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-39=0

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

-3x=39

x=39/-3

x=-13

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