                                                                                  

        

⑴                        

⑵            

⑶            

⑷              

⑸5             

⑹                  

⑺                

       

                                        x        

x=x/6+x/12+x/7+5+x/2+4

x=84      84  

        ⑵⑶          84/6+84/12=14+7=21   

   x/7 5             21+84/7+5=21+12+5=38                4      84           84-4=80  

                         