21=7(x+6)

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Solution for 21=7(x+6) equation: 



21=7(x+6)

We move all terms to the left:

21-(7(x+6))=0



We calculate terms in parentheses: -(7(x+6)), so:

7(x+6)

We multiply parentheses

7x+42

Back to the equation:

-(7x+42)



We get rid of parentheses

-7x-42+21=0

We add all the numbers together, and all the variables

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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