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-8n+7(-8n+7)=-399
We simplify the equation to the form, which is simple to understand
-8n+7(-8n+7)=-399
Reorder the terms in parentheses
-8n+(-56n+49)=-399
Remove unnecessary parentheses
-8n-56n+49=-399
We move all terms containing n to the left and all other terms to the right.
-8n-56n=-399-49
We simplify left and right side of the equation.
-64n=-448
We divide both sides of the equation by -64 to get n.
n=7
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