-21=-7(x-3)

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



-21=-7(x-3)

We move all terms to the left:

-21-(-7(x-3))=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-42=0

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

7x=42

x=42/7

x=6

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