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;+∞)