( d + 2 785 ) - 3 097 = 1 780
d + 2 785 = 1 780 + 3 097
d + 2 785 = 4 877
d = 4 877 - 2 785
d = 2 092 → numarul, aflat prin metoda mersului invers
Verific: ( 2 092 + 2 785 ) - 3 097 = 4 877 - 3 097 = 1 780
