(x-2)*(12-x)<=9 12x-24-x^2+2x-9<=0 -x^2+14x-33<=0 x^2-14x+33>=0 x=7+-sqrt(49-33)=7+-4 x1=11 x2=3 2<x<12 x>=11 x<=3 (2;3] U [11;12)