57x-309=-31(99+13x)

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Solution for 57x-309=-31(99+13x) equation: 



57x-309=-31(99+13x)

We move all terms to the left:

57x-309-(-31(99+13x))=0

We add all the numbers together, and all the variables

57x-(-31(13x+99))-309=0



We calculate terms in parentheses: -(-31(13x+99)), so:

-31(13x+99)

We multiply parentheses

-403x-3069

Back to the equation:

-(-403x-3069)



We get rid of parentheses

57x+403x+3069-309=0

We add all the numbers together, and all the variables

460x+2760=0

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

460x=-2760

x=-2760/460

x=-6

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