Răspuns :
2 x [ 10 + 7 x ( 82 - 81 ) ] + X < 2011
2 x [ 10 + 7 x 1 ] + X < 2011
2 x [ 10 + 7 ] + X < 2011
2 x 17 + X < 2011
34 + X < 2011
X= 2011 - 34
X= 1977
2 x [ 10 + 7 x 1 ] + X < 2011
2 x [ 10 + 7 ] + X < 2011
2 x 17 + X < 2011
34 + X < 2011
X= 2011 - 34
X= 1977