# How do you simplify -55n + 28n + 21n + 7n - n?

Sep 5, 2016

$0$

#### Explanation:

These are all like terms. Simplify into one term, taking the positive and negative terms into consideration.

$- 55 n + 28 n + 21 n + 7 n - n$

= $\textcolor{b l u e}{28 n + 21 n + 7 n} \textcolor{red}{- 55 n - n}$

= $\textcolor{b l u e}{56 n} \textcolor{red}{- 56 n}$

= $0$