Răspuns: x = 1
Explicație pas cu pas:
306 : 3 - { 15 - 5 × [ 8 - 2 × ( 3 : x ) ] + 23} : 4 = 95
102 - { 15 - 5 × [ 8 - 2 × ( 3 : x ) ] + 23} : 4 = 95
{ 15 - 5 × [ 8 - 2 × ( 3 : x ) ] + 23} : 4 = 102 - 95
{ 15 - 5 × [ 8 - 2 × ( 3 : x ) ] + 23} : 4 = 7
15 - 5 × [ 8 - 2 × ( 3 : x ) ] + 23 = 7 × 4
15 - 5 × [ 8 - 2 × ( 3 : x ) ] + 23 = 28
15 - 5 × [ 8 - 2 × ( 3 : x ) ] = 28 - 23
15 - 5 × [ 8 - 2 × ( 3 : x ) ] = 5
5 × [ 8 - 2 × ( 3 : x ) ] = 15 - 5
5 × [ 8 - 2 × ( 3 : x ) ] = 10
8 - 2 × ( 3 : x ) = 10 : 5
8 - 2 × ( 3 : x ) = 2
2 × ( 3 : x ) = 8 - 2
2 × ( 3 : x ) = 6
3 : x = 6 : 2
3 : x = 3
x = 3 : 3
x = 1 → numarul, aflat prin metoda mersului invers
