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(-1x-3))+21=0



We calculate terms in parentheses: -(7(-1x-3)), so:

7(-1x-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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