| 2x - 6 | < n can be simplified to \( \boxed{?a} \) - \( \frac{n}{?b}\) < x < \( \boxed{?a} \) + \( \frac{n}{?b}\) where \( \boxed{?a} \) and \( \boxed{?b} \) are algebraic values. What is \( \boxed{?a} \) + \( \boxed{?b} \)?

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