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=0

x=0/7

x=0

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