84=-7(x-9)

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Solution for 84=-7(x-9) equation: 



84=-7(x-9)

We move all terms to the left:

84-(-7(x-9))=0



We calculate terms in parentheses: -(-7(x-9)), so:

-7(x-9)

We multiply parentheses

-7x+63

Back to the equation:

-(-7x+63)



We get rid of parentheses

7x-63+84=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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