-3x-(-21)=-3x(-21)

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



-3x-(-21)=-3x(-21)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-3x(-21)), so:

-3x(-21)

We multiply parentheses

63x

Back to the equation:

-(63x)



We add all the numbers together, and all the variables

-66x+21=0

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

-66x=-21

x=-21/-66

x=7/22

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