78984*253-77777+9798465: 5*2-78945+1

1)78984*253=19982952

2)9798465:5=1959693

3)1959693*2=3919386

4)19982952-77777=19905175

5)19905175+3919386=23824561

6)23824561-78945=23745616

7)23745616+1=23745617

        78987               19983711        9798465 : 5 = 1959693 х 2 = 3919386

      х    253             -       77777  

      236961               19905934            19905934

    394935                                            + 3919386

  157974                                          

                                          23825320

  19983711                                         -       78945

                                                             23746375 + 1 = 23 746 376