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+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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