-21=3(-4+3x)

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



-21=3(-4+3x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

3(3x-4)

We multiply parentheses

9x-12

Back to the equation:

-(9x-12)



We get rid of parentheses

-9x+12-21=0

We add all the numbers together, and all the variables

-9x-9=0

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

-9x=9

x=9/-9

x=-1

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