-21=-2(3x+4)

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Solution for -21=-2(3x+4) equation: 



-21=-2(3x+4)

We move all terms to the left:

-21-(-2(3x+4))=0



We calculate terms in parentheses: -(-2(3x+4)), so:

-2(3x+4)

We multiply parentheses

-6x-8

Back to the equation:

-(-6x-8)



We get rid of parentheses

6x+8-21=0

We add all the numbers together, and all the variables

6x-13=0

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

6x=13

x=13/6

x=2+1/6

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