Which of the following is equal to the rational expression when x is not equal to 5 or -3?
x^2+x-6/x^2-2x-15
Ax-2/x+3
Bx+3/x-5
Cx-6/x-5
Dx-2/x-5
x^2+x-6/x^2-2x-15
Ax-2/x+3
Bx+3/x-5
Cx-6/x-5
Dx-2/x-5