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                                                17.12.2020 14:58
                                                
                                                123polinapolina 
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                                                gahakadbobo22 
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                                             27081984e 
                                                17.12.2020 14:56
                                                
                                                27081984e 
                                                17.12.2020 14:56
                                             foximmortal 
                                                17.12.2020 14:56
                                                
                                                foximmortal 
                                                17.12.2020 14:56
                                             skotnikova04 
                                                17.12.2020 14:56
                                                
                                                skotnikova04 
                                                17.12.2020 14:56
                                             Roost11 
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                                                Roost11 
                                                17.12.2020 14:56
                                            
Х + 15 = 17 + 8
Х + 15 = 25
Х =25 -15
Х=10
проверка: ( 10 + 15) -8 = 17
17 = 17
x+15=17-8
x=15