Răspuns :
105 - 2 × { 6055 : 7 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 55
105 - 2 × { 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 55
2 × { 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 105 - 55
2 × { 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 50
{ 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 50 : 2
{ 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 25
{ 6 × [ 424 - 4 × ( 74 - x ) ] } = 865 - 25
{ 6 × [ 424 - 4 × ( 74 - x ) ] } = 840
[ 424 - 4 × ( 74 - x ) ] = 840 : 6
[ 424 - 4 × ( 74 - x ) ] = 140
[ 4 × ( 74 - x ) ] = 424 - 140
[ 4 × ( 74 - x ) ] = 284
74 - x = 284 : 4
74 - x = 71
x = 74 - 71
x = 3 => numărul aflat
105 - 2 × { 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 55
2 × { 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 105 - 55
2 × { 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 50
{ 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 50 : 2
{ 865 - 6 × [ 424 - 4 × ( 74 - x ) ] } = 25
{ 6 × [ 424 - 4 × ( 74 - x ) ] } = 865 - 25
{ 6 × [ 424 - 4 × ( 74 - x ) ] } = 840
[ 424 - 4 × ( 74 - x ) ] = 840 : 6
[ 424 - 4 × ( 74 - x ) ] = 140
[ 4 × ( 74 - x ) ] = 424 - 140
[ 4 × ( 74 - x ) ] = 284
74 - x = 284 : 4
74 - x = 71
x = 74 - 71
x = 3 => numărul aflat