-21=-7(3+x)

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Solution for -21=-7(3+x) equation: 



-21=-7(3+x)

We move all terms to the left:

-21-(-7(3+x))=0

We add all the numbers together, and all the variables

-(-7(x+3))-21=0



We calculate terms in parentheses: -(-7(x+3)), so:

-7(x+3)

We multiply parentheses

-7x-21

Back to the equation:

-(-7x-21)



We get rid of parentheses

7x+21-21=0

We add all the numbers together, and all the variables

7x=0

x=0/7

x=0

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