(2x+3)/(x²+x-12)-1/2≤0 (4x+6-x²-x+12)/(x²+x-12)≤0 (-x²+3x+18)/(x²+x-12)≤0 (x²-3x-18)/(x²+x-12)≤0 (x-6)(x+3)/(x+4)(x-3)≤0 x=6 x=-3 x=-4 x=3 + _ + _ + ------(-4)--------[-3]---------(3)--------[6]------- x∈(-4;-3] U (3;6]