5. Among the teachers of a certain middle school, the total number of people who can speak English and Russian is 110. According to statistics, 75 people can speak English, and 55 people can speak Russian. The number of teachers in the school who can speak English but not Russian is . $\qquad$
5. 55 people.

Let the set of people who can speak English be $E$, and the set of people who can speak Russian be $R$, then $|E|=75,|R|=55,|E \cup R|=$ 110. Also, $|E \cup R|=|E|+|R|-|E \cap R|$, so $|E \cap R|=20$, thus $|E \cap \bar{R}|=|E|-|E \cap R|=55$.