21=(-2x-9)(-7)

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Solution for 21=(-2x-9)(-7) equation: 



21=(-2x-9)(-7)

We move all terms to the left:

21-((-2x-9)(-7))=0

We multiply parentheses ..

-((+14x+63))+21=0



We calculate terms in parentheses: -((+14x+63)), so:

(+14x+63)

We add all the numbers together, and all the variables

(14x+63)

We get rid of parentheses

14x+63

Back to the equation:

-(14x+63)



We get rid of parentheses

-14x-63+21=0

We add all the numbers together, and all the variables

-14x-42=0

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

-14x=42

x=42/-14

x=-3

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