X/x+3-3/x-1+13/x^2+2x-3<= 0<br>
x/x+3-3/x-1+13/x*(x+3)-(x+3)≤0
x/x+3-3/x-1+13/(x-1)*(x+3)≤ 0
x*(x-1)-3(x+3)+13/(x-1)*(x+3)≤0
x^2-x-3x-9+13/(x-1)*(x+3)≤0
x^2-4x+4/(x-1)*(x+3)≤0
(x-2)²/(x-1)*(x+3)≤0
{(x-2)²≤0
{(x-1)*(x+3)>0
{(x-2)²≥0
{(x-1)*(x+3)<0<br>
{x=2
{x∈(-∞,-3)∪(1,+∞)
{x∈R
{x∈(-3,1)
x=2
x∈(-3,1)