21=-7(x-2)

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



21=-7(x-2)

We move all terms to the left:

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



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

-7(x-2)

We multiply parentheses

-7x+14

Back to the equation:

-(-7x+14)



We get rid of parentheses

7x-14+21=0

We add all the numbers together, and all the variables

7x+7=0

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

7x=-7

x=-7/7

x=-1

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