Răspuns :
998 + { 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = 1 000
{ 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = = 1 000 - 998
{ 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = 2
7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 = 2 × 10
7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 = 20
7 x [ 6 - ( 4 + 2 × x ) : 5 ] = 20 + 8
7 x [ 6 - ( 4 + 2 × x ) : 5] = 28
6 - ( 4 + 2 × x ) : 5 = 28 : 7
6 - ( 4 + 2 × x ) : 5 = 4
( 4 + 2 × x ) : 5 = 6 - 4
( 4 + 2 × x ) : 5 = 2
4 + 2 × x = 2 × 5
4 + 2 × x = 10
2 × x = 10 - 4
2 × x = 6
x = 6 : 2
x = 3
{ 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = = 1 000 - 998
{ 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = 2
7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 = 2 × 10
7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 = 20
7 x [ 6 - ( 4 + 2 × x ) : 5 ] = 20 + 8
7 x [ 6 - ( 4 + 2 × x ) : 5] = 28
6 - ( 4 + 2 × x ) : 5 = 28 : 7
6 - ( 4 + 2 × x ) : 5 = 4
( 4 + 2 × x ) : 5 = 6 - 4
( 4 + 2 × x ) : 5 = 2
4 + 2 × x = 2 × 5
4 + 2 × x = 10
2 × x = 10 - 4
2 × x = 6
x = 6 : 2
x = 3
998 + { 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = 1 000{ 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = = 1 000 - 998 { 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 } : 10 = 2 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 = 2 × 10 7 x [ 6 - ( 4 + 2 × x ) : 5 ] - 8 = 20 7 x [ 6 - ( 4 + 2 × x ) : 5 ] = 20 + 8 7 x [ 6 - ( 4 + 2 × x ) : 5] = 28 6 - ( 4 + 2 × x ) : 5 = 28 : 7 6 - ( 4 + 2 × x ) : 5 = 4 ( 4 + 2 × x ) : 5 = 6 - 4 ( 4 + 2 × x ) : 5 = 2 4 + 2 × x = 2 × 5 4 + 2 × x = 10 2 × x = 10 - 4 2 × x = 6 x=6:3x=3