-399=7(5x+3)

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Solution for -399=7(5x+3) equation: 



-399=7(5x+3)

We move all terms to the left:

-399-(7(5x+3))=0



We calculate terms in parentheses: -(7(5x+3)), so:

7(5x+3)

We multiply parentheses

35x+21

Back to the equation:

-(35x+21)



We get rid of parentheses

-35x-21-399=0

We add all the numbers together, and all the variables

-35x-420=0

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

-35x=420

x=420/-35

x=-12

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