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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-3x-4)-(4(-1x+21))=0

We get rid of parentheses

3x-(4(-1x+21))+4=0



We calculate terms in parentheses: -(4(-1x+21)), so:

4(-1x+21)

We multiply parentheses

-4x+84

Back to the equation:

-(-4x+84)



We get rid of parentheses

3x+4x-84+4=0

We add all the numbers together, and all the variables

7x-80=0

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

7x=80

x=80/7

x=11+3/7

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