7(-8x+7)=-399

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



7(-8x+7)=-399

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-56x+49+399=0

We add all the numbers together, and all the variables

-56x+448=0

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

-56x=-448

x=-448/-56

x=+8

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