J'ai un devoir maison à faire qui pourrait m'aider s'il vous plaît ✌️

A = 7/15 - 2/15 *9/15                                            
A = 5/15*9/15                                                       
A = 45/15                                                              
A = 5*9/5*3                                                           
A = 9/3 ( On simplifie)                                          
A= 3*3/3*1                                                            
A = 3/1 ( On simplifie encore )
A = 3