399=7(1-8x)

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Solution for 399=7(1-8x) equation: 



399=7(1-8x)

We move all terms to the left:

399-(7(1-8x))=0

We add all the numbers together, and all the variables

-(7(-8x+1))+399=0



We calculate terms in parentheses: -(7(-8x+1)), so:

7(-8x+1)

We multiply parentheses

-56x+7

Back to the equation:

-(-56x+7)



We get rid of parentheses

56x-7+399=0

We add all the numbers together, and all the variables

56x+392=0

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

56x=-392

x=-392/56

x=-7

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