Х+1/3 : 1/2=4/5

х+2/3=4/5

х=4/5-2/3

х=2/15

Проверка:  2/15+1/3:1/2=4/5

                      2/15+2/3=4/5

                         12/15=4/5

                            4/5=4/5

Verified answer

х+1/3 / 1/2=4/5

x+2/3=4/5

x=2/15