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