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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(7(-7x-3))-21=0



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

7(-7x-3)

We multiply parentheses

-49x-21

Back to the equation:

-(-49x-21)



We get rid of parentheses

-1x+49x+21-21=0

We add all the numbers together, and all the variables

48x=0

x=0/48

x=0

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