X^2 - x - 6 >= 0;
4x^2 - 4x - 2*(x^2 + 2x + 2) <= 8;<br>
x^2 - x - 6 >=0;
4x^2 - 4x - 2x^2 - 4x - 4 <= 8;<br>
x^2 - x - 6 >= 0;
2x^2 - 8x - 4 - 8 <= 0;<br>
x^2 - x - 6 .= 0;
2x^2 - 8x - 12 <=0;<br>
x^2 - x - 6 = 0;
x^2 - 4x - 6 <=0<br>
x >= 4x;
x <= x/4<br>
а там честно не знаю