Неравенство (3x^2-6x+2-1/(x+2))(x-1)-3<=0
(3x²-6x+1)/((x+2)(x-1))-3≤0
(3x²-6x+1-3x²-3x+6)/((x+2)(x-1))≤0
(-9x+1)/((x+2)(x-1))≤0
x∈(-2;1/9}∪(1;+∞)