Question 288443
(x)/(x^2+6x+9) + (3)/(x^2-9)

x/ (x+3)^2  + 3/ (x+3)(x-3)


LCM = (x+3)^2(x-3)

x(x-3) +3(x+3) / (x+3)^2(x-3)

x^2-3x+3x+9 / (x+3)^2(x-3)

x^2+9 / (x+3)^2(x-3)