21=-7(2x-7)

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



21=-7(2x-7)

We move all terms to the left:

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



We calculate terms in parentheses: -(-7(2x-7)), so:

-7(2x-7)

We multiply parentheses

-14x+49

Back to the equation:

-(-14x+49)



We get rid of parentheses

14x-49+21=0

We add all the numbers together, and all the variables

14x-28=0

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

14x=28

x=28/14

x=2

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