x(3x-2)-[2x(x+1)+2x^2]≤2-x^2
3x^2-2x-(2x^2+2x+2x^2)≤2-x^2
3x^2-2x-4x^2-2x≤2-x^2
(3-4+1)x^2-4x≤2
-4x≤2
x≥-1/2