-21-4x=-7+3(x-7)

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Solution for -21-4x=-7+3(x-7) equation: 



-21-4x=-7+3(x-7)

We move all terms to the left:

-21-4x-(-7+3(x-7))=0



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

-7+3(x-7)

determiningTheFunctionDomain
3(x-7)-7

We multiply parentheses

3x-21-7

We add all the numbers together, and all the variables

3x-28

Back to the equation:

-(3x-28)



We get rid of parentheses

-4x-3x+28-21=0

We add all the numbers together, and all the variables

-7x+7=0

We move all terms containing x to the left, all other terms to the right

-7x=-7

x=-7/-7

x=1

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