# Chapter 9 - Roots and Radicals - Chapters 1-9 Cumulative Review Problem Set: 72

{$-\frac{19}{10}$}

#### Work Step by Step

Grouping like terms and then isolating the variable, we obtain: Step 1: $-7-2n-6n=7n-5n+12$ Step 2: $-7-8n=2n+12$ Step 3: $-8n-2n=12+7$ Step 4: $-10n=19$ Step 5: $n=-\frac{19}{10}$ Therefore, the solution set is {$-\frac{19}{10}$}.

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