1 154 + 7 × [ 1 008 - 6 × ( 9 - 6 × u : 3 ) ] = 8 000
7 × [ 1 008 - 6 × ( 9 - 6 × u : 3 ) ] = 8 000 - 1 154
7 × [ 1 008 - 6 × ( 9 - 6 × u : 3 ) ] = 6 846
1 008 - 6 × ( 9 - 6 × u : 3 ) = 6 846 : 7
1 008 - 6 × ( 9 - 6 × u : 3 ) = 978
6 × ( 9 - 6 × u : 3 ) = 1 008 - 978
6 × ( 9 - 6 × u : 3 ) = 30
9 - 6 × u : 3= 30 : 6
9 - 6 × u : 3= 5
6 × u : 3 = 9 - 5
6 × u : 3 = 4
6 × u = 4 × 3
6 × u = 12
u = 12 : 6
u = 2 → numarul aflat prin metoda mersului invers