What is the simplified form of the quantity of x plus 5, all over the quantity of 9 − the quantity of x plus 4, all over the quantity of x plus 6? the quantity of x squared plus 20x plus 66, all over 9 times the quantity of x plus 6 the quantity of x squared plus 2x minus 6, all over 9 times the quantity of x plus 6 the quantity of x plus 1, all over the quantity of 3 minus x the quantity of 1, all over the quantity of 3 minus x