-(5x-7)=3(x+21)

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Solution for -(5x-7)=3(x+21) equation: 



-(5x-7)=3(x+21)

We move all terms to the left:

-(5x-7)-(3(x+21))=0

We get rid of parentheses

-5x-(3(x+21))+7=0



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

3(x+21)

We multiply parentheses

3x+63

Back to the equation:

-(3x+63)



We get rid of parentheses

-5x-3x-63+7=0

We add all the numbers together, and all the variables

-8x-56=0

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

-8x=56

x=56/-8

x=-7

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