Chapter 2 - Real Numbers - 2.2 - Addition and Subtraction of Rational Numbers - Problem Set 2.2 - Page 58: 92

$-\frac{89}{56}n$

We first apply the distributive property. Then, we simplify the resultant expression: $-\frac{3}{8}n-n-\frac{3}{14}n$ =$n(-\frac{3}{8}-1-\frac{3}{14})$ =$n(\frac{-3(7)-1(56)-3(4)}{56})$ =$n(\frac{-21-56-12}{56})$ =$n(\frac{-21-68}{56})$ =$n(\frac{-89}{56})$ =$-\frac{89}{56}n$