$\frac{2}{3}-x=\frac{5}{6}$

My name is Nguyen Minh Trung.I'm a new student in class 6A. I'm from Da Nang and my family still lives there. In Ho Chi MINH City,I live with my grandparents at 21/3B Nguyen Trai street.My new school is not far our house-about one kilometetr, so I go to school by bike .There are alot of students in my new school.But I don't have any friends.I'm unhappy                                                    I miss my parents , my sister and my friends in Da Nang.                                                                       1.Which grade isTrung  in?                                                                                                                    2.Is he a new student?                                                                                                                            3. Where is he from

$\frac{2}{5}:x=\frac{3}{7}$