8х-2<х-1
8х-х< -1+2
7х<1
х< 1/7
2х²-х-1≤0
2х²+х-2х-1≤0
х×(2х+1)-(2х+1)≤0
(2х+1)×(х-1)≤0
{х≤ -1/2
{х⩾ 1
{х⩾ -1/2
{х≤ 1
х∈∅
х∈ [ -1/2, 1 ]
/ - дробь
