621=-9(-7x-13)

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Solution for 621=-9(-7x-13) equation: 



621=-9(-7x-13)

We move all terms to the left:

621-(-9(-7x-13))=0



We calculate terms in parentheses: -(-9(-7x-13)), so:

-9(-7x-13)

We multiply parentheses

63x+117

Back to the equation:

-(63x+117)



We get rid of parentheses

-63x-117+621=0

We add all the numbers together, and all the variables

-63x+504=0

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

-63x=-504

x=-504/-63

x=+8

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