9x+21=-3(-4x)

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Solution for 9x+21=-3(-4x) equation: 



9x+21=-3(-4x)

We move all terms to the left:

9x+21-(-3(-4x))=0



We calculate terms in parentheses: -(-3(-4x)), so:

-3(-4x)

We multiply parentheses

12x

Back to the equation:

-(12x)



We add all the numbers together, and all the variables

-3x+21=0

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

-3x=-21

x=-21/-3

x=+7

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