-21=-7(x+1)

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Solution for -21=-7(x+1) equation: 



-21=-7(x+1)

We move all terms to the left:

-21-(-7(x+1))=0



We calculate terms in parentheses: -(-7(x+1)), so:

-7(x+1)

We multiply parentheses

-7x-7

Back to the equation:

-(-7x-7)



We get rid of parentheses

7x+7-21=0

We add all the numbers together, and all the variables

7x-14=0

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

7x=14

x=14/7

x=2

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