21-7x=7(3-x)

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Solution for 21-7x=7(3-x) equation: 



21-7x=7(3-x)

We move all terms to the left:

21-7x-(7(3-x))=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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